Bump black from 24.3.0 to 26.3.1 in /.tools/readmes

Bumps [black](https://github.com/psf/black) from 24.3.0 to 26.3.1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@24.3.0...26.3.1)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.3.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.tools/readmes/requirements_freeze.txt

@@ -1,5 +1,5 @@
 aws_doc_sdk_examples_tools @ git+https://github.com/awsdocs/aws-doc-sdk-examples-tools@2025.41.0
-black==24.3.0
+black==26.3.1
 certifi==2025.1.31
 charset-normalizer==3.4.1
 click==8.1.8