New features

• Add support for reading buildcaches created by Spack v0.22 (#41773)

Bugfixes

• spack graph: fix coloring with environments (#41240)
• spack info: sort variants in --variants-by-name (#41389)
• Spec.format: error on old style format strings (#41934)
• ASP-based solver:
  • fix infinite recursion when computing concretization errors (#41061)
  • don't error for type mismatch on preferences (#41138)
  • don't emit spurious debug output (#41218)
• Improve the error message for deprecated preferences (#41075)
• Fix MSVC preview version breaking clingo build on Windows (#41185)
• Fix multi-word aliases (#41126)
• Add a warning for unconfigured compiler (#41213)
• environment: fix an issue with deconcretization/reconcretization of specs (#41294)
• buildcache: don't error if a patch is missing, when installing from binaries (#41986)
• Multiple improvements to unit-tests (#41215,#41369,#41495,#41359,#41361,#41345,#41342,#41308,#41226)

Package updates

• root: add a webgui patch to address security issue (#41404)
• BerkeleyGW: update source urls (#38218)