Bump yamllint from 1.26.2 to 1.26.3 in /.github/workflows

Bumps [yamllint](https://github.com/adrienverge/yamllint) from 1.26.2 to 1.26.3.
- [Release notes](https://github.com/adrienverge/yamllint/releases)
- [Changelog](https://github.com/adrienverge/yamllint/blob/master/CHANGELOG.rst)
- [Commits](adrienverge/yamllint@v1.26.2...v1.26.3)

---
updated-dependencies:
- dependency-name: yamllint
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
 pip==21.2.4
 ansible==4.4.0
-yamllint==1.26.2
+yamllint==1.26.3
 ansible-lint==5.1.2