Correct doc detection in GH release run (#104)

Author: pablogsal

.github/workflows/source-and-docs-release.yml

@@ -93,7 +93,7 @@ jobs:
         uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         # Conditionally run this step if there is a 'docs/' directory.
         # Docs aren't built for alpha or beta releases.
-        if: ${{ hashFiles('cpython/${{ inputs.cpython_release }}/docs') != '' }}
+        if: ${{ hashFiles(format('cpython/{0}/docs', inputs.cpython_release)) != '' }}
         with:
           name: docs
           path: |