fix: skip pynufft on Python 3.13 CI

pynufft's build process tries to compile scipy from source in an
isolated build environment, failing without system OpenBLAS. Install
only numba on 3.13; pynufft remains available via [optional] on 3.12.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
   unittest:
     runs-on: ubuntu-latest
     strategy:
-      fail-fast: false
+      fail-fast: false
       matrix:
         python-version: ['3.12', '3.13']
     steps:
@@ -72,7 +72,7 @@ jobs:
         if [ "${{ matrix.python-version }}" = "3.12" ]; then
           pip install "./PyAutoArray[optional]" "./PyAutoGalaxy[optional]" "./PyAutoLens[optional]"
         else
-          pip install numba pynufft
+          pip install numba
         fi
     - name: Run tests
       run: |