fix: Fix the last element of the C# namespace to V1Beta1 instead of V1beta1 (#468)

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PiperOrigin-RevId: 375638678
Source-Link: googleapis/googleapis@d4d6443

Author: yoshi-automation

Diff for: proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/TextToSpeechProto.java

@@ -132,7 +132,7 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "exttospeech.v1beta1B\021TextToSpeechProtoP\001"
           + "ZMgoogle.golang.org/genproto/googleapis/"
           + "cloud/texttospeech/v1beta1;texttospeech\370"
-          + "\001\001\252\002!Google.Cloud.TextToSpeech.V1beta1\312\002"
+          + "\001\001\252\002!Google.Cloud.TextToSpeech.V1Beta1\312\002"
           + "!Google\\Cloud\\TextToSpeech\\V1beta1\352\002$Goo"
           + "gle::Cloud::TextToSpeech::V1beta1b\006proto"
           + "3"

Diff for: proto-google-cloud-texttospeech-v1beta1/src/main/proto/google/cloud/texttospeech/v1beta1/cloud_tts.proto

@@ -21,7 +21,7 @@ import "google/api/client.proto";
 import "google/api/field_behavior.proto";
 
 option cc_enable_arenas = true;
-option csharp_namespace = "Google.Cloud.TextToSpeech.V1beta1";
+option csharp_namespace = "Google.Cloud.TextToSpeech.V1Beta1";
 option go_package = "google.golang.org/genproto/googleapis/cloud/texttospeech/v1beta1;texttospeech";
 option java_multiple_files = true;
 option java_outer_classname = "TextToSpeechProto";

Diff for: synth.metadata

@@ -4,23 +4,23 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-texttospeech.git",
-        "sha": "8fb9a13fd5e1313eb746537b2f30afefdfd0d7b4"
+        "sha": "1eeca2807eb2a1cb3f3c1edb9d761a27d3b404a1"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "45445f476c39de13be89a3c5a45b67c7a2320fcf",
-        "internalRef": "365608171"
+        "sha": "d4d64433e6a99a018b6169ddd0a3aee6fe4c779f",
+        "internalRef": "375638678"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "45445f476c39de13be89a3c5a45b67c7a2320fcf",
-        "internalRef": "365608171"
+        "sha": "d4d64433e6a99a018b6169ddd0a3aee6fe4c779f",
+        "internalRef": "375638678"
       }
     },
     {