chore(bazel): update protobuf to v3.21.3 (#892)

- [ ] Regenerate this pull request now.

chore(bazel): update gax-java to 2.18.4

PiperOrigin-RevId: 463115700

Source-Link: googleapis/googleapis@52130a9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6a4d9d9bb3afb20b0f5fa4f5d9f6740b1d0eb19a
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNmE0ZDlkOWJiM2FmYjIwYjBmNWZhNGY1ZDlmNjc0MGIxZDBlYjE5YSJ9

Author: gcf-owl-bot[bot]

java-monitoring/README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-monitoring'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-monitoring:3.3.2'
+implementation 'com.google.cloud:google-cloud-monitoring:3.3.3'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "3.3.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "3.3.3"
 ```
 
 ## Authentication

java-monitoring/proto-google-cloud-monitoring-v3/src/main/java/com/google/monitoring/v3/NotificationChannelDescriptor.java

@@ -2197,8 +2197,8 @@ public int getSupportedTiersValue(int index) {
      *
      * @deprecated google.monitoring.v3.NotificationChannelDescriptor.supported_tiers is deprecated.
      *     See google/monitoring/v3/notification.proto;l=75
-     * @param index The index of the value to return.
-     * @return The enum numeric value on the wire of supportedTiers at the given index.
+     * @param index The index to set the value at.
+     * @param value The enum numeric value on the wire for supportedTiers to set.
      * @return This builder for chaining.
      */
     @java.lang.Deprecated

java-monitoring/proto-google-cloud-monitoring-v3/src/main/java/com/google/monitoring/v3/UptimeCheckConfig.java

@@ -10500,8 +10500,8 @@ public int getSelectedRegionsValue(int index) {
      *
      * <code>repeated .google.monitoring.v3.UptimeCheckRegion selected_regions = 10;</code>
      *
-     * @param index The index of the value to return.
-     * @return The enum numeric value on the wire of selectedRegions at the given index.
+     * @param index The index to set the value at.
+     * @param value The enum numeric value on the wire for selectedRegions to set.
      * @return This builder for chaining.
      */
     public Builder setSelectedRegionsValue(int index, int value) {