- Update Spack to version 0.21.1
  * Add support for reading buildcaches created by Spack v0.22
  * Bugfixes
    + `spack graph`: fix coloring with environments
    + `spack info`: sort variants in --variants-by-name
    + `Spec.format`: error on old style format strings
    + ASP-based solver:
       - fix infinite recursion when computing concretization
         errors,
       - don't error for type mismatch on preferences,
       - don't emit spurious debug output.
    + Improve the error message for deprecated preferences.
    + Fix multi-word aliases.
    + Add a warning for unconfigured compiler.
    + environment: fix an issue with deconcretization/reconcretization
      of specs.
    + buildcache: don't error if a patch is missing, when
      installing from binaries
- From version 0.21.0
  * following new features:
    + Better error messages with condition chaining:
      In v0.18, we added better error messages that could tell you
      what problem happened, but they couldn't tell you why it
      happened. 0.21 adds condition chaining to the solver, and
      Spack can now trace back through the conditions that led to
      an error and build a tree of causes potential causes and
      where they came from.
    + OCI build caches:
      You can now use an arbitrary OCI registry as a build cache:
      - For Dockerhub:

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