chore(bazel): update protobuf to v3.21.3 (#724)

- [ ] 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

proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechRequest.java

@@ -1853,8 +1853,8 @@ public int getEnableTimePointingValue(int index) {
      * repeated .google.cloud.texttospeech.v1beta1.SynthesizeSpeechRequest.TimepointType enable_time_pointing = 4;
      * </code>
      *
-     * @param index The index of the value to return.
-     * @return The enum numeric value on the wire of enableTimePointing at the given index.
+     * @param index The index to set the value at.
+     * @param value The enum numeric value on the wire for enableTimePointing to set.
      * @return This builder for chaining.
      */
     public Builder setEnableTimePointingValue(int index, int value) {