chore: Update to use go v1.25.6

[kalleep]

Update to latest go version includes bug fixes and security fixes for:

• CVE-2025-68121
• CVE-2025-61728
• CVE-2025-61726
• CVE-2025-61731
• CVE-2025-68119

[github-actions]

🔍 Dependency Review

No third-party module versions changed in any go.mod. The only change in go.mod files is a patch bump of the Go toolchain version from 1.25.5 to 1.25.6 across multiple modules. Patch releases of Go are limited to bug and security fixes and do not include language or standard library API changes.

Below is the assessment for the Go version bump.

Go toolchain go 1.25.5 -> 1.25.6 — ✅ Safe

• Scope of change:

  • go directive updated in:
    • ./go.mod
    • ./collector/go.mod
    • ./extension/alloyengine/go.mod
    • ./syntax/go.mod

• Expected impact:

  • Per Go’s release policy, patch releases only include bug and security fixes and do not change language semantics or public stdlib APIs.
  • No code changes are required to adopt a patch-level Go update.

• References:

  • Go release policy: https://go.dev/doc/devel/release#policy

• Code changes required: None.

Notes

• Non-go.mod changes (CI workflow build images and Docker base images) were updated to corresponding 1.25.6-compatible images. These are outside the scope of this review per the instructions.