Update GitHub workflows to Python 3.13

.github/workflows/ResInsightMac.yml

@@ -70,7 +70,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: Display Python version
         run: python -c "import sys; print(sys.version)"

.github/workflows/ResInsightWithCache.yml

@@ -102,7 +102,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: "3.12"
+          python-version: "3.13"
       - name: Display Python version
         run: python -c "import sys; print(sys.version)"
 

.github/workflows/python-linting.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: actions/setup-python@v7
         with:
-          python-version: '3.12'
+          python-version: '3.13'
 
       - name: Install ruff
         run: pip install "ruff==0.15.*"

.github/workflows/spell-check-pr.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       
       - name: Install codespell
         run: pip install codespell

.github/workflows/spell-check.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       
       - name: Install codespell
         run: pip install codespell

.github/workflows/test-latest-rips-with-latest-resinsight.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: Install latest rips from PyPI
         run: |