chore(all): auto-regenerate gapics

This is an auto-generated regeneration of the gapic clients by
cloud.google.com/go/internal/gapicgen. Once the corresponding genproto PR is
submitted, genbot will update this PR with a newer dependency to the newer
version of genproto and assign reviewers to this PR.

If you have been assigned to review this PR, please:

- Ensure that the version of genproto in go.mod has been updated.
- Ensure that CI is passing. If it's failing, it requires your manual attention.
- Approve and submit this PR if you believe it's ready to ship.

Corresponding genproto PR: googleapis/go-genproto#669

Changes:

feat(aiplatform): add Vizier service to aiplatform v1
  Committer: @dizcology
  PiperOrigin-RevId: 394116440
  Source-Link: googleapis/googleapis@67c780b

docs(dialogflow/cx): clarified some LRO types docs: fixed some wrong update mask descriptions
  PiperOrigin-RevId: 394033461
  Source-Link: googleapis/googleapis@aa15f32

aiplatform/apiv1/gapic_metadata.json

@@ -529,6 +529,90 @@
           }
         }
       }
+    },
+    "VizierService": {
+      "clients": {
+        "grpc": {
+          "libraryClient": "VizierClient",
+          "rpcs": {
+            "AddTrialMeasurement": {
+              "methods": [
+                "AddTrialMeasurement"
+              ]
+            },
+            "CheckTrialEarlyStoppingState": {
+              "methods": [
+                "CheckTrialEarlyStoppingState"
+              ]
+            },
+            "CompleteTrial": {
+              "methods": [
+                "CompleteTrial"
+              ]
+            },
+            "CreateStudy": {
+              "methods": [
+                "CreateStudy"
+              ]
+            },
+            "CreateTrial": {
+              "methods": [
+                "CreateTrial"
+              ]
+            },
+            "DeleteStudy": {
+              "methods": [
+                "DeleteStudy"
+              ]
+            },
+            "DeleteTrial": {
+              "methods": [
+                "DeleteTrial"
+              ]
+            },
+            "GetStudy": {
+              "methods": [
+                "GetStudy"
+              ]
+            },
+            "GetTrial": {
+              "methods": [
+                "GetTrial"
+              ]
+            },
+            "ListOptimalTrials": {
+              "methods": [
+                "ListOptimalTrials"
+              ]
+            },
+            "ListStudies": {
+              "methods": [
+                "ListStudies"
+              ]
+            },
+            "ListTrials": {
+              "methods": [
+                "ListTrials"
+              ]
+            },
+            "LookupStudy": {
+              "methods": [
+                "LookupStudy"
+              ]
+            },
+            "StopTrial": {
+              "methods": [
+                "StopTrial"
+              ]
+            },
+            "SuggestTrials": {
+              "methods": [
+                "SuggestTrials"
+              ]
+            }
+          }
+        }
+      }
     }
   }
 }