CI: update testing matrix

Author: dmgav

.github/workflows/black.yml

@@ -13,7 +13,7 @@ jobs:
           persist-credentials: false
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.11
+          python-version: 3.13
       - name: Install Dependencies
         run: |
           # These packages are installed in the base environment but may be older

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.13]
       fail-fast: false
 
     steps:

.github/workflows/docs_publish.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.13]
       fail-fast: false
 
     steps: