build(uv): Bump urllib3 from 2.6.2 to 2.6.3

[dependabot]

Bumps urllib3 from 2.6.2 to 2.6.3.

Release notes

Sourced from urllib3's releases.

2.6.3

🚀 urllib3 is fundraising for HTTP/2 support

urllib3 is raising ~$40,000 USD to release HTTP/2 support and ensure long-term sustainable maintenance of the project after a sharp decline in financial support. If your company or organization uses Python and would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and thousands of other projects please consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.

Thank you for your support.

Changes

• Fixed a security issue where decompression-bomb safeguards of the streaming API were bypassed when HTTP redirects were followed. (CVE-2026-21441 reported by @​D47A, 8.9 High, GHSA-38jv-5279-wg99)
• Started treating Retry-After times greater than 6 hours as 6 hours by default. (urllib3/urllib3#3743)
• Fixed urllib3.connection.VerifiedHTTPSConnection on Emscripten. (urllib3/urllib3#3752)

Changelog

Sourced from urllib3's changelog.

2.6.3 (2026-01-07)

• Fixed a high-severity security issue where decompression-bomb safeguards of the streaming API were bypassed when HTTP redirects were followed. (GHSA-38jv-5279-wg99 <https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99>__)
• Started treating Retry-After times greater than 6 hours as 6 hours by default. ([#3743](https://github.com/urllib3/urllib3/issues/3743) <https://github.com/urllib3/urllib3/issues/3743>__)
• Fixed urllib3.connection.VerifiedHTTPSConnection on Emscripten. ([#3752](https://github.com/urllib3/urllib3/issues/3752) <https://github.com/urllib3/urllib3/issues/3752>__)

Commits

• 0248277 Release 2.6.3
• 8864ac4 Merge commit from fork
• 70cecb2 Fix Scorecard issues related to vulnerable dev dependencies (#3755)
• 41f249a Move "v2.0 Migration Guide" to the end of the table of contents (#3747)
• fd4dffd Patch VerifiedHTTPSConnection for Emscripten (#3752)
• 13f0bfd Handle massive values in Retry-After when calculating time to sleep for (#3743)
• 8c480bf Bump actions/upload-artifact from 5.0.0 to 6.0.0 (#3748)
• 4b40616 Bump actions/cache from 4.3.0 to 5.0.1 (#3750)
• 82b8479 Bump actions/download-artifact from 6.0.0 to 7.0.0 (#3749)
• 34284cb Mention experimental features in the security policy (#3746)
• Additional commits viewable in compare view

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[github-actions]

KICS version: v2.1.19

Category Results CRITICAL 0 HIGH 0 MEDIUM 4 LOW 0 INFO 0 TRACE 0 TOTAL 4	Metric Values Files scanned 7 Files parsed 7 Files failed to scan 0 Total executed queries 73 Queries failed to execute 0 Execution time 1

Queries Results

Query Name Query Id Severity Platform Cwe Risk Score Category Experimental Description File Name Line Issue Type Search Key Expected Value Actual Value Apt Get Install Pin Version Not Defined 965a08d7-ef86-4f14-8792-4a3b2098937e MEDIUM Dockerfile 1357 5.7 Supply-Chain false When installing a package, its pin version should be defined Dockerfile 36 MissingAttribute FROM={{debian:stable-slim@sha256:449673e1239be6fdc89616f926abb87f360c280c3bb7ca3591694564359695fa AS base}}.RUN={{apt-get update && apt-get upgrade --yes && apt-get install --yes --no-install-recommends curl && rm -rf /var/lib/apt/lists/*}} Package 'curl' has version defined Package 'curl' does not have version defined Apt Get Install Pin Version Not Defined 965a08d7-ef86-4f14-8792-4a3b2098937e MEDIUM Dockerfile 1357 5.7 Supply-Chain false When installing a package, its pin version should be defined Dockerfile 94 MissingAttribute FROM={{dev AS compile}}.RUN={{apt-get update && apt-get install --yes --no-install-recommends binutils patchelf && rm -rf /var/lib/apt/lists/*}} Package 'patchelf' has version defined Package 'patchelf' does not have version defined Apt Get Install Pin Version Not Defined 965a08d7-ef86-4f14-8792-4a3b2098937e MEDIUM Dockerfile 1357 5.7 Supply-Chain false When installing a package, its pin version should be defined Dockerfile 94 MissingAttribute FROM={{dev AS compile}}.RUN={{apt-get update && apt-get install --yes --no-install-recommends binutils patchelf && rm -rf /var/lib/apt/lists/*}} Package 'binutils' has version defined Package 'binutils' does not have version defined Apt Get Install Pin Version Not Defined 965a08d7-ef86-4f14-8792-4a3b2098937e MEDIUM Dockerfile 1357 5.7 Supply-Chain false When installing a package, its pin version should be defined Dockerfile 46 MissingAttribute FROM={{base AS dev}}.RUN={{apt-get update && apt-get install --yes --no-install-recommends build-essential && rm -rf /var/lib/apt/lists/*}} Package 'build-essential' has version defined Package 'build-essential' does not have version defined

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	0.96s
✅ EDITORCONFIG	editorconfig-checker	1		0	0	0.22s
✅ REPOSITORY	checkov	yes		no	no	12.8s
✅ REPOSITORY	gitleaks	yes		no	no	0.76s
✅ REPOSITORY	git_diff	yes		no	no	0.0s
✅ REPOSITORY	grype	yes		no	no	27.4s
✅ REPOSITORY	secretlint	yes		no	no	0.76s
✅ REPOSITORY	semgrep	yes		no	no	16.39s
✅ REPOSITORY	syft	yes		no	no	1.96s
✅ REPOSITORY	trivy	yes		no	no	5.03s
✅ REPOSITORY	trivy-sbom	yes		no	no	0.08s
✅ REPOSITORY	trufflehog	yes		no	no	2.43s

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