fix: bump microsoft/action-python/.github/workflows/validation.yml

Bumps [microsoft/action-python/.github/workflows/validation.yml](https://github.com/microsoft/action-python) from 0.6.4 to 0.7.3.
- [Release notes](https://github.com/microsoft/action-python/releases)
- [Commits](microsoft/action-python@0.6.4...0.7.3)

---
updated-dependencies:
- dependency-name: microsoft/action-python/.github/workflows/validation.yml
  dependency-version: 0.7.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   validation:
-    uses: microsoft/action-python/.github/workflows/validation.yml@0.6.4
+    uses: microsoft/action-python/.github/workflows/validation.yml@0.7.3
     with:
       workdir: '.'