Bump yamllint from 1.25.0 to 1.26.1 (#304)

Bumps [yamllint](https://github.com/adrienverge/yamllint) from 1.25.0 to 1.26.1.
- [Release notes](https://github.com/adrienverge/yamllint/releases)
- [Changelog](https://github.com/adrienverge/yamllint/blob/master/CHANGELOG.rst)
- [Commits](adrienverge/yamllint@v1.25.0...v1.26.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_dev.txt

@@ -12,4 +12,4 @@ Sphinx==3.5.3
 twine==3.4.1
 watchdog==2.0.2
 wheel
-yamllint==1.25.0
+yamllint==1.26.1