chore(deps): update go module directive to v1.27.1

[scality-renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.25.0 → 1.27.1

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Dependency Bump Evaluation

Version change: Go 1.25.0 → 1.27.1 (multi-minor jump, skips 1.26 entirely)
Semver bump type: minor (x2)

Changes:

• Go module directive bumped from 1.25.0 to 1.27.1
• require blocks reorganized (no dependency version changes)
• Only go.mod modified; Dockerfile and CI tooling not updated

Breaking changes:

• encoding/json v2 backend (Go 1.27): Now rejects invalid UTF-8 and duplicate JSON keys. Error message text changed. Opt-out: GOEXPERIMENT=nojsonv2. This codebase uses json.Unmarshal in e2e tests and relies on controller-runtime which heavily uses JSON serialization for CRDs.
• crypto/tls hardening (Go 1.26+1.27): Post-quantum key exchanges enabled by default; tlsrsakex, tls3des, tls10server GODEBUG settings permanently removed. This codebase configures TLS in cmd/main.go and webhook tests.
• Timer channels permanently unbuffered (Go 1.27): asynctimerchan GODEBUG removed. No direct usage found in this codebase, but controller-runtime may use timers internally.
• go mod tidy enforces exactly two require blocks for go 1.27+ modules.
• go test runs stdversion vet check by default, failing on stdlib symbols newer than the module's go directive.
• Green Tea GC enabled by default (Go 1.26), changing GC timing.

Security concerns: None — this is a Go toolchain upgrade with no new dependencies. Crypto changes strengthen TLS defaults.

Impact on codebase:

• encoding/json used in test/e2e/e2e_test.go (token unmarshaling) — low direct risk but controller-runtime CRD serialization may be affected
• crypto/tls configured in cmd/main.go (lines 72, 107, 136, 185) and webhook_suite_test.go — modern TLS usage, unlikely to break
• No time.NewTimer/time.NewTicker, url.Parse, or ReverseProxy usage found

Recommendation: REVIEW REQUIRED

Notes:

1. CI is broken — PR is incomplete. The Dockerfile (golang:1.25 on line 2) and golangci-lint (v2.5.0, built with Go 1.25) both need updating to support Go 1.27.1:
   • Dockerfile:2 — update base image from golang:1.25 to golang:1.27
   • .github/workflows/pre-merge.yaml:47 — update golangci-lint to a version built with Go 1.27+
2. Multi-minor jump risk. Jumping from 1.25 → 1.27 skips Go 1.26 entirely. Both releases contain breaking stdlib changes (JSON v2, TLS hardening, timer semantics). Run the full test suite after fixing CI to verify compatibility.
3. Suggested approach: Fix the Dockerfile and lint config in this PR (or a companion PR), then verify all CI checks pass before merging.

— Claude Code