chore(deps): update go module directive to v1.27.0

[scality-renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.25.0 → 1.27.0

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Dependency Bump Evaluation

Version change: go 1.25.0 -> 1.27.0 (two minor version jump)
Semver bump type: minor (x2)

Changes (Go 1.26 + 1.27 highlights):

Go 1.26:

• Green Tea GC enabled by default (10-40% reduced GC overhead)
• Post-quantum TLS key exchanges enabled by default
• net/url.Parse rejects URLs with colons in host
• net/http.ServeMux trailing-slash redirects changed from 301 to 307
• io.ReadAll returns minimally-sized slices
• crypto/rsa PKCS#1 v1.5 encryption deprecated
• httputil.ReverseProxy.Director deprecated
• Crypto functions ignore random parameter (always use secure internal source)

Go 1.27:

• encoding/json backed by v2 - rejects invalid UTF-8 and duplicate JSON keys
• asynctimerchan GODEBUG permanently removed - timer channels always unbuffered
• Removed GODEBUG settings now cause build failures (not silent)
• go test runs stdversion vet check by default
• net.UnixConn read methods return io.EOF directly (not wrapped in net.OpError)
• HTTP/1 Response.Body auto-drains on close
• compress/flate output bytes may differ (affects gzip, zip, png)
• crypto/ecdsa.PrivateKey.Sign validates hash length
• Generic methods added to the language
• macOS 13 Ventura minimum required
• bzr VCS support removed

Breaking changes: Multiple across two Go releases, but none directly affect this codebase:

• encoding/json: only used in e2e tests (test/e2e/e2e_test.go:327) to unmarshal well-formed Kubernetes API output - low risk. Kubernetes API machinery uses sigs.k8s.io/json / json-iterator/go, not encoding/json directly.
• Crypto packages: uses modern APIs (x509.CreateRevocationList, crypto.Signer, x509.ParsePKCS8PrivateKey) - no deprecated functions.
• No usage of: time.NewTimer/NewTicker, net.UnixConn, url.Parse, io.ReadAll, http.ServeMux, httputil.ReverseProxy, compress/flate/gzip/zip/png, GODEBUG directives.

Security concerns: None - Go 1.26/1.27 improve security (post-quantum TLS, json v2 strictness). No supply chain risk with Go toolchain releases.

Impact on codebase: No affected patterns found for any breaking change. However, the PR is incomplete - it only updates go.mod but not the Dockerfile or CI tooling.

Recommendation: REVIEW REQUIRED

Notes:

CI is failing due to version mismatches introduced by this PR:

1. Build failure (Build image step): Dockerfile line 2 uses golang:1.25 base image. Go 1.25 cannot compile a module declaring go 1.27.0 with GOTOOLCHAIN=local.

2. Lint failure: golangci-lint v2.5.0 was built with Go 1.25 and refuses to lint a project targeting Go 1.27.0: can't load config: the Go language version (go1.25) used to build golangci-lint is lower than the targeted Go version (1.27.0).

Before merging, this PR needs:

• Update Dockerfile base image from golang:1.25 to golang:1.27
• Update golangci-lint to a version built with Go 1.27+ (or update the CI action version)
• All CI checks passing

The Go version bump itself is safe for this codebase - the operator does not use any APIs affected by Go 1.26/1.27 breaking changes.

— Claude Code