deps: Bump MessagePack from 2.5.303 to 2.5.305

[dependabot]

Updated MessagePack from 2.5.303 to 2.5.305.

Release notes

Sourced from MessagePack's releases.

2.5.305

Security fix

• Fixes Unescaped dot metacharacters in AssemblyNameVersionSelectorRegex cause catastrophic backtracking

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v2.5.303...v2.5.305

Commits viewable in compare view.

[github-actions]

📦 Build metrics

Artifact sizes for 330cdcc vs the base branch (38411fb).

Packages (compressed .nupkg)

Artifact	base	PR	Δ
Microsoft.UI.Reactor.nupkg	1.75 MB	1.75 MB	-22 B (0.00%)	≈
Microsoft.UI.Reactor.Advanced.nupkg	492.6 KB	492.6 KB	-5 B (0.00%)	≈
Microsoft.UI.Reactor.Devtools.nupkg	288.0 KB	288.0 KB	-12 B (0.00%)	≈

Assemblies in Microsoft.UI.Reactor

Artifact	base	PR	Δ
Reactor.Analyzers.dll	373.0 KB	373.0 KB	+0 B (0.00%)	≈
Reactor.dll	2.48 MB	2.48 MB	+0 B (0.00%)	≈
Reactor.Localization.Generator.dll	16.0 KB	16.0 KB	+0 B (0.00%)	≈
Reactor.Wrappers.Abstractions.dll	10.5 KB	10.5 KB	+0 B (0.00%)	≈
Reactor.Wrappers.Generator.dll	99.5 KB	99.5 KB	+0 B (0.00%)	≈

Assemblies in Microsoft.UI.Reactor.Advanced

Artifact	base	PR	Δ
Reactor.Advanced.dll	1.00 MB	1.00 MB	+0 B (0.00%)	≈

Assemblies in Microsoft.UI.Reactor.Devtools

Artifact	base	PR	Δ
Microsoft.UI.Reactor.Devtools.dll	788.0 KB	788.0 KB	+0 B (0.00%)	≈

No size change beyond the noise floor. ✅

_{✅ smaller / ⚠️ larger / ≈ within noise. Sizes come from a Release dotnet pack on the CI runner: packages are the compressed .nupkg download size, assemblies the uncompressed DLL inside it.
workflow run.}

[github-actions]

🧪 Merged coverage

Coverage for 330cdcc vs the base branch (38411fb) — unit + selftest merged.

Metric	base	PR	Δ
Line	86.23%	86.22%	-0.01 pp	≈
Branch	77.40% (966/1248)	77.40% (966/1248)	0.00 pp	≈

No coverage change beyond the noise floor. ✅

_{✅ higher / ⚠️ lower / ≈ within noise. Δ is in percentage points; coverage is unit + selftest merged (Debug x64) on the CI runner. Cobertura reports attached to the workflow run as artifacts.}