ci: point package check at apify/actions main branch

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vdusek

.github/workflows/_check_package.yaml

@@ -27,7 +27,7 @@ jobs:
         run: uv run poe build
 
       - name: Verify built package
-        uses: apify/actions/python-package-check@feat/python-package-check-action
+        uses: apify/actions/python-package-check@main
         with:
           package_name: apify_shared
           dist_dir: dist

.github/workflows/manual_release_beta.yaml

@@ -61,7 +61,7 @@ jobs:
           ref: ${{ needs.changelog_update.outputs.changelog_commitish }}
 
       - name: Verify built package
-        uses: apify/actions/python-package-check@feat/python-package-check-action
+        uses: apify/actions/python-package-check@main
         with:
           package_name: apify_shared
           dist_dir: dist

.github/workflows/manual_release_stable.yaml

@@ -96,7 +96,7 @@ jobs:
           ref: ${{ needs.changelog_update.outputs.changelog_commitish }}
 
       - name: Verify built package
-        uses: apify/actions/python-package-check@feat/python-package-check-action
+        uses: apify/actions/python-package-check@main
         with:
           package_name: apify_shared
           dist_dir: dist