Dependabot auto approve

[Zeitsperre]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes issue #xyz
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• HISTORY.rst has been updated (with summary of main changes)

What kind of change does this PR introduce?:

• Updates the Dependabot config to run less often.
• Adds a workflow that automatically approves and merges patch and minor updates.

Does this PR introduce a breaking change?:

No. This just adds some more repository automation.

Other information:

This change is being made to address the following announcement:

Beginning January 27, 2026, Dependabot will no longer support the https://github.com/dependabot merge command. Please use GitHub's native pull request controls instead. Please see the changelog announcement for additional details.

[coveralls]

Pull Request Test Coverage Report for Build 21011247117

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.288%

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Totals
Change from base Build 20822428330:	0.0%
Covered Lines:	3186
Relevant Lines:	3650

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💛 - Coveralls