chore: bump styled-components version to 6.1.15

[jeylost]

What/Why/How?

This PR aims to address CVE-2024-55565.
styled-components has released version 6.1.15 with the fix.

Check yourself

• Code changed? - Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4c71f84

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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Click here to learn what changesets are, and how to add one.

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[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	950.3 ± 14.3	931.0	975.2	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	969.1 ± 16.3	949.7	998.1	1.02 ± 0.02

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.6%	5053/6429
🟡	Branches	67.18%	2059/3065
🟡	Functions	73.16%	834/1140
🟡	Lines	78.88%	4767/6043

Test suite run success

836 tests passing in 120 suites.

Report generated by 🧪jest coverage report action from 4c71f84

[jeylost]

Should the bumping of a package be included in the package changeset?

[tatomyr]

@jeylost no, it's not needed I think. I'll ignore that.
However, the tests are failing due to snapshot size changes (which is expected, but we've just released a broken version because of assuming it's expected, so it's better to test it separately). Let's check that case offline.