chore(deps): update go module directive to v1.26.6

[scality-renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
go (source)	golang	patch	1.26.5 → 1.26.6	1.27.0 (+1)

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[github-actions]

Dependency Bump Evaluation

Version change: Go 1.26.5 -> 1.26.6 (patch)
Files changed: go.mod only (1 line - go directive)

Changes (Go 1.26.6, released 2026-08-13):

Security fixes (7):

• html/template: XSS caused by wrong JavaScript regexp context tracking
• net/url: quadratic complexity in resolvePath (DoS vector)
• encoding/xml: (*Decoder).DecodeElement bypasses recursion-depth guard
• net / x/net/dns/dnsmessage: panic when parsing invalid SVCB record
• CVE-2026-33818, CVE-2026-56864, CVE-2026-56865
• crypto/tls: FIPS 140-3 Extended Master Secret enforcement escape hatch

Bug fixes (5): compiler correctness (prove bug, MIPS spill/miscompile), runtime SIGSEGV under high panic load.

Breaking changes: None

Security concerns: None negative -- this bump fixes 7 security issues. Merging promptly is recommended.

Impact on codebase: This project does not directly import the most critical affected packages (html/template, encoding/xml, net/url, net/http). crypto/tls is used in cmd/main.go and the webhook test suite; net appears in the webhook test suite. All standard library fixes are picked up at compile time and also benefit the project transitively through controller-runtime, client-go, and other dependencies.

CI status: Checks are in progress (build, generate, lint, test, test-e2e). Merge once CI is green.

Recommendation: SAFE TO MERGE (once CI passes)

-- Claude Code