build: fix python-version selection with actions

s/PYTHON\_VERSION/python-version

Refs: https://github.com/actions/setup-python
Refs: #32609

PR-URL: #33589
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

.github/workflows/linters.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@v1
         with:
-          PYTHON_VERSION: ${{ env.PYTHON_VERSION }}
+          python-version: ${{ env.PYTHON_VERSION }}
       - name: Environment Information
         run: npx envinfo
       - name: Lint C/C++ files
@@ -64,7 +64,7 @@ jobs:
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@v1
         with:
-          PYTHON_VERSION: ${{ env.PYTHON_VERSION }}
+          python-version: ${{ env.PYTHON_VERSION }}
       - name: Environment Information
         run: npx envinfo
       - name: Lint Python