fix(deps): update module gitlab.com/gitlab-org/api/client-go to v1.21.0 (#6028)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -56,7 +56,7 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0
 	github.com/yaronf/httpsign v0.4.1
 	github.com/zalando/go-keyring v0.2.6
-	gitlab.com/gitlab-org/api/client-go v1.19.0
+	gitlab.com/gitlab-org/api/client-go v1.21.0
 	go.uber.org/multierr v1.11.0
 	golang.org/x/crypto v0.47.0
 	golang.org/x/net v0.49.0

go.sum

@@ -597,8 +597,8 @@ github.com/zalando/go-keyring v0.2.6 h1:r7Yc3+H+Ux0+M72zacZoItR3UDxeWfKTcabvkI8u
 github.com/zalando/go-keyring v0.2.6/go.mod h1:2TCrxYrbUNYfNS/Kgy/LSrkSQzZ5UPVH85RwfczwvcI=
 github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
 github.com/ziutek/mymysql v1.5.4/go.mod h1:LMSpPZ6DbqWFxNCHW77HeMg9I646SAhApZ/wKdgO/C0=
-gitlab.com/gitlab-org/api/client-go v1.19.0 h1:6gRiXuoVeXbX2ijhpHtgYPWrrmNq0i2eG111O8L7+N4=
-gitlab.com/gitlab-org/api/client-go v1.19.0/go.mod h1:ctGKgv9bErQHO0NOrfhoyFtKMAkBhUE7y53F2xHFAkE=
+gitlab.com/gitlab-org/api/client-go v1.21.0 h1:/wRGVTUKndZoew4FBW/Ev/EZalAsfH/mNa4kkFJwSUQ=
+gitlab.com/gitlab-org/api/client-go v1.21.0/go.mod h1:ctGKgv9bErQHO0NOrfhoyFtKMAkBhUE7y53F2xHFAkE=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
 go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
 go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 h1:TT4fX+nBOA/+LUkobKGW1ydGcn+G3vRw9+g5HwCphpk=