Bump LightningDB from 0.21.0 to 0.22.0

[dependabot]

Updated LightningDB from 0.21.0 to 0.22.0.

Release notes

Sourced from LightningDB's releases.

0.22.0

Native library updated to LMDB 0.9.35

The bundled native binaries for all platforms are updated from LMDB 0.9.33 to 0.9.35, picking up upstream fixes including a race condition on spilled pages during transaction commit (ITS#​9564), a memory leak with nested transactions (ITS#​10342), and mdb_env_copy2 failures with values over 2GB (ITS#​10346).

Allocation-free cursor enumeration and reads

• cursor.AsEnumerable() and cursor.AllValuesFor(key) now return struct enumerables (CursorEnumerable, CursorDuplicateValuesEnumerable). Iterating with foreach no longer allocates an iterator state machine or boxed enumerator. Both types still implement IEnumerable, so existing LINQ usage keeps working.
• New non-throwing TryGet overloads copy values into caller-owned memory: TryGet(db, key, Span destination, out int valueLength) reports the required size instead of throwing when the buffer is too small, and a TryGet(db, key, IBufferWriter) overload supports growable buffers. Reading 1,000 × 256-byte values via the span overload allocates 56 bytes total versus ~280 KB with the out byte[] overload, and is ~11% faster.
• LightningEnvironment.Version no longer allocates on every access.

Fixes

• size_t results are now marshalled as nuint instead of int, fixing truncation of values over 2GB (thanks @​patrik-lindberg — Patrik Lindberg)
• LightningCursor.Count now throws OverflowException on overflow instead of silently wrapping (Patrik Lindberg)

Breaking changes

• Recompile required: the return types of AsEnumerable/AllValuesFor changed from IEnumerable to struct enumerables. Source-compatible for foreach and LINQ; binary compatibility is broken. AllValuesFor now takes ReadOnlySpan instead of Span (also source-compatible).
• ios-arm runtime removed: the 32-bit armv7s iOS binary can no longer be built with any modern iOS SDK, and .NET 6+ supports only arm64 on iOS. All other iOS/simulator RIDs remain.

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