ci: Upgrade setup-python to v5

v2 is broken, see actions/setup-python#1085.

Signed-off-by: Nils Wistoff <nwistoff@iis.ee.ethz.ch>

Author: niwis

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
           submodules: recursive
       -
         name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: 3.9
           cache: pip

.github/workflows/lint.yml

@@ -79,7 +79,7 @@ jobs:
       uses: actions/checkout@v3
     -
       name: Install Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: 3.9
         cache: pip

.github/workflows/publish-docs.yml

@@ -23,7 +23,7 @@ jobs:
           submodules: recursive
       -
         name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: 3.9
           cache: pip