CI: Use latest spack

Author: gsjaardema

.github/workflows/spack.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Set up Spack
       uses: spack/setup-spack@5ab3c91bdefffffad9a7e45d1d156146afebb3a7 # v2.1.1
       with:
-        ref: v0.22.2      # Spack version (examples: develop, releases/v0.21)
+        ref: develop      # Spack version (examples: develop, releases/v0.23)
         buildcache: true  # Configure oci://ghcr.io/spack/github-actions-buildcache
         color: true       # Force color output (SPACK_COLOR=always)
         path: spack       # Where to clone Spack