Use latest Python, Actions

Author: benmwebb

.github/workflows/build.yml

@@ -15,12 +15,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.13"]
+        python-version: ["3.14"]
         imp-branch: [main, develop]
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup conda