chore: increase retry limit on emulator (#3373)

Author: olavloite

google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/ReadWriteTransaction.java

@@ -284,7 +284,7 @@ private ReadWriteTransaction(Builder builder) {
     // emulator is fast, so increasing the limit is reasonable.
     this.maxInternalRetries =
         builder.usesEmulator && builder.retryAbortsInternally
-            ? DEFAULT_MAX_INTERNAL_RETRIES * 10
+            ? DEFAULT_MAX_INTERNAL_RETRIES * 50
             : DEFAULT_MAX_INTERNAL_RETRIES;
     this.dbClient = builder.dbClient;
     this.delayTransactionStartUntilFirstWrite = builder.delayTransactionStartUntilFirstWrite;