chore(main): release google-cloud-security_center-v1 1.9.1 (#33721)

* chore(main): release google-cloud-security_center-v1 1.9.1

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: release-please[bot]

.release-please-manifest.json

@@ -739,7 +739,7 @@
   "google-cloud-security-public_ca-v1beta1+FILLER": "0.0.0",
   "google-cloud-security_center": "2.1.0",
   "google-cloud-security_center+FILLER": "0.0.0",
-  "google-cloud-security_center-v1": "1.9.0",
+  "google-cloud-security_center-v1": "1.9.1",
   "google-cloud-security_center-v1+FILLER": "0.0.0",
   "google-cloud-security_center-v1p1beta1": "0.21.1",
   "google-cloud-security_center-v1p1beta1+FILLER": "0.0.0",

google-cloud-security_center-v1/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Release History
 
+### 1.9.1 (2026-04-03)
+
+#### Documentation
+
+* update SelectiveGapicGeneration usage doc ([#33481](https://github.com/googleapis/google-cloud-ruby/issues/33481)) 
+
 ### 1.9.0 (2026-04-02)
 
 #### Features

google-cloud-security_center-v1/lib/google/cloud/security_center/v1/version.rb

@@ -21,7 +21,7 @@ module Google
   module Cloud
     module SecurityCenter
       module V1
-        VERSION = "1.9.0"
+        VERSION = "1.9.1"
       end
     end
   end

google-cloud-security_center-v1/snippets/snippet_metadata_google.cloud.securitycenter.v1.json

@@ -1,7 +1,7 @@
 {
   "client_library": {
     "name": "google-cloud-security_center-v1",
-    "version": "1.9.0",
+    "version": "1.9.1",
     "language": "RUBY",
     "apis": [
       {