ci: bump actions/setup-python from 4 to 5 (#11)

Author: dependabot[bot]

.github/workflows/main.yml

@@ -106,7 +106,7 @@ jobs:
         plumed info --root
         cat $(plumed info --root)/json/syntax.json | jq '.["ENDPLUMED"]'
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: "3.x"
     - name: Install pypa/build