deps: Update dependency blacken-docs to >=1.20.0,<2

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This PR contains the following updates:

Package	Type	Update	Change
blacken-docs	feature-lint	minor	>=1.19.1,<2 -> >=1.20.0,<2

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Release Notes

asottile/blacken-docs (blacken-docs)

v1.20.0

Compare Source

• Support Python 3.14.

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Configuration

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pixi.lock

ExecError: Command failed: pixi lock --no-progress --color=never --quiet
Error:   × failed to solve requirements of environment 'py313' for platform 'osx-64'
  ├─▶   × failed to solve the environment
  │   
  ╰─▶ Cannot solve the request because of: No candidates were found for typos
      >=1.36.2,<2.