v0.5.0-beta.2

Full release notes to follow in the final v0.5.0 release.

• internal/core/adt: base error mode on requested state by @mpvl in 214e112
• internal/core/adt: only set validation result when safe by @mpvl in 88857e0
• internal/core/adt: pass desired state to more functions by @mpvl in 55cdb74
• internal/core/adt: pass more state around by @mpvl in 3dfeb41
• internal/core/adt: pass state to validation by @mpvl in 0954c6f
• internal/core/adt: pass state to evaluate by @mpvl in 7d50228
• internal/core/adt: avoid duplicate insertion of conjuncts by @mpvl in d341814
• internal/core/adt: tighten uniqueness of conjuncts by @mpvl in a68c6ce
• cue/parser: disallow deprecated language features in API by @mpvl in 67ace83
• internal/core/adt: remove nested comprehension special casing by @mpvl in 3c0b2ec
• README: fix the stale GitHub Actions badge by @mvdan in 4fee020
• internal/core/adt: disambiguate let cache by @mpvl in 43fc681
• internal/core/adt: update stats to fix build breakage by @mpvl in a800e6f
• internal/core/adt: merge Conjunct and Partial processing by @mpvl in 121894c
• internal/core/adt: remove assertion by @mpvl in 129c343
• internal/core/adt: add test cases for issue 2119 by @mpvl in 2499719
• internal/core/adt: add tests related to Issue #2113 by @mpvl in 525648d
• internal/core/adt: evaluate let fields earlier in comprehensions by @mpvl in e5fb5af
• internal/core/adt: detect cycles in patterns by @mpvl in c048135
• cue: update Value.Source doc comment by @rogpeppe in 45ce7a3
• tools/flow: add debug support via CUE_DEBUG_TOOLS_FLOW by @myitcv in d85f950
• internal/core/adt: fix comprehension cycle regression by @mpvl in 32bfffd
• internal/core/adt: add tests to address regressions by @mpvl in 82bf036
• internal/core/adt: split some tests into files by @mpvl in 69ee994
• infra: upgrade goreleaser by @myitcv in 7bdeb14