Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

…age to 18.3.1 (#4233)

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

* Initial plan

* Fix TUnit0023 false positive for Func<IDisposable> fields

Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

* Fix null-conditional operator consistency in analyzer

Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

* Initial plan

* Fix generic DependsOn<T> attribute to correctly extract type from type argument

Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

* perf: reduce allocations in generated code

* perf: use `if` statement for generated assertions

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

…on types (#4248)

* Fix nullability warnings in Assert.That() for collection types

- Update Assert.That() overloads to accept nullable parameters:
  - IList<TItem>?
  - IDictionary<TKey, TValue>?
  - IReadOnlyDictionary<TKey, TValue>?
  - ISet<TItem>?
  - HashSet<TItem>?
  - IReadOnlySet<TItem>? (NET5+)
  - IReadOnlyList<TItem>?
  - TItem[]?
- Update corresponding assertion class constructors to accept nullable values
- Add CollectionNullabilityWarningTests to verify the fix
- Update public API snapshots

Fixes false positive nullability warning when calling
Assert.That(list).IsNotNull() with nullable List<T>?, IList<T>?,
Dictionary<TKey,TValue>?, IDictionary<TKey,TValue>?, etc.

Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

* Add missing IReadOnlySet<T>? nullability tests

Added 3 tests for IReadOnlySet<T>? to complete the test coverage
for all nullable collection types supported by Assert.That().
Tests are conditionally compiled for .NET 5.0+ where IReadOnlySet<T>
is available.

Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thomhurst <30480171+thomhurst@users.noreply.github.com>