Update Python version to 3.13 in workflows

Project requires Python >=3.13 (per pyproject.toml)

Author: alokemajumder

.github/workflows/release.yml

@@ -33,7 +33,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.13'
 
     - name: Install dependencies
       run: |

.github/workflows/security.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.13'
 
     - name: Install audit tools
       run: |
@@ -73,7 +73,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.13'
 
     - name: Run Bandit
       run: |