Backport security and toolchain updates for v0.24.1 patch release

[guicassolato]

Summary

Cherry-picked security fixes and toolchain updates for the v0.24.1 patch release.

Changes

• Backports PR Upgrade Go to 1.25.9 #304: Upgrade Go to 1.25.9
• Backports PR Upgrade golang.org/x/net to v0.55.0 #315: Upgrade golang.org/x/net to v0.55.0

Semver Classification

All changes are patch-safe:

PR	Change	Classification	Reason
#304	Go 1.25.8 → 1.25.9	SAFE	Toolchain patch version update
#315	golang.org/x/net v0.52.0 → v0.55.0	SAFE	Indirect dependency, security fix for idna package

Verification

• ✓ PR Upgrade Go to 1.25.9 #304: Go toolchain version bump only, no code changes
• ✓ PR Upgrade golang.org/x/net to v0.55.0 #315: All golang.org/x packages are indirect dependencies (// indirect in go.mod)
• ✓ No direct imports of golang.org/x packages in the codebase
• ✓ Changes are dependency updates only (go.mod, go.sum)
• ✓ No inter-PR dependencies detected
• ✓ Cherry-picks applied cleanly in chronological order

Related

• Backports Upgrade Go to 1.25.9 #304
• Backports Upgrade golang.org/x/net to v0.55.0 #315
• Part of v0.24.1 patch release preparation

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Generated via /kdt:patch-release workflow

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