chore(deps): update dependency modernmavericks/swift-toolchain to v6.3.3-mavericks.4

[renovate]

This PR contains the following updates:

Package	Update	Change
ModernMavericks/swift-toolchain	patch	6.3.3-mavericks.1 → 6.3.3-mavericks.4

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Release Notes

ModernMavericks/swift-toolchain (ModernMavericks/swift-toolchain)

v6.3.3-mavericks.4

Compare Source

6.3.3-mavericks.4

Automated release of the pinned Swift build environment.

v6.3.3-mavericks.3

Compare Source

ModernMavericks swift-toolchain 6.3.3-mavericks.3.

• Repackage of the pinned Swift 6.3.3 build environment. pins.env is unchanged:
  same SWIFT_VERSION, same SWIFT_SHA, same swiftlang/llvm-project commit.
• First release through the artifact conformance check, which asserts that the
  published artifacts agree with each other and with the family's schemes. The
  mirrored swift.org .pkg keeps upstream's version, floor and identifier — a
  declared, scoped deviation recorded in INGREDIENTS.md.

v6.3.3-mavericks.2

Compare Source

ModernMavericks swift-toolchain 6.3.3-mavericks.2.

• Repackage of the pinned Swift 6.3.3 build environment. No change to pins.env:
  same SWIFT_VERSION, same SWIFT_SHA, same swiftlang/llvm-project commit.
• Cut to exercise the shared publish-release.yml, which now owns asset selection,
  SHA256SUMS, and the Release body for every repo in the family.

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