Update tool dependencies and fix new lint issues (#36702)

## Summary
- Update golangci-lint v2.9.0 → v2.10.1, misspell v0.7.0 → v0.8.0,
actionlint v1.7.10 → v1.7.11
- Fix 20 new QF1012 staticcheck findings by using `fmt.Fprintf` instead
of `WriteString(fmt.Sprintf(...))`
- Fix SA1019: replace deprecated `ecdsa.PublicKey` field access with
`PublicKey.Bytes()` for JWK encoding, with SEC 1 validation and curve
derived from signing algorithm
- Add unit test for `ToJWK()` covering P-256, P-384, and P-521 curves,
also verifying correct coordinate padding per RFC 7518
- Remove dead staticcheck linter exclusion for "argument x is
overwritten before first use"

## Test plan
- [x] `make lint-go` passes with 0 issues
- [x] `go test ./services/oauth2_provider/ -run
TestECDSASigningKeyToJWK` passes for all curves

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

modules/git/foreachref/format.go

@@ -53,7 +53,7 @@ func (f Format) Flag() string {
 	var formatFlag strings.Builder
 	for i, field := range f.fieldNames {
 		// field key and field value
-		formatFlag.WriteString(fmt.Sprintf("%s %%(%s)", field, field))
+		fmt.Fprintf(&formatFlag, "%s %%(%s)", field, field)
 
 		if i < len(f.fieldNames)-1 {
 			// note: escape delimiters to allow control characters as