chore: spack-v0.22.1

Includes some git CVE fixes, https://github.blog/2024-05-14-securing-git-addressing-5-new-vulnerabilities/, as well as non-package-related fixes to spack itself, full list at https://github.com/spack/spack/releases/tag/v0.22.1 (several affect us, some requested by us).

spack-environment/packages.yaml

@@ -386,6 +386,8 @@ packages:
     require:
     - '@5.6.9'
     - cxxstd=20 -davix +python +scitokens-cpp
+    package_attributes:
+      url: https://github.com/xrootd/xrootd/releases/download/v5.6.9/xrootd-5.6.9.tar.gz
   zlib-api:
     require:
     - zlib-ng