fix(deps): update grpc-java monorepo to v1.64.0 (#788)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

providers/flagd/pom.xml

@@ -15,7 +15,7 @@
     <properties>
         <!-- exclusion expression for e2e tests -->
         <testExclusions>**/e2e/*.java</testExclusions>
-        <io.grpc.version>1.63.0</io.grpc.version>
+        <io.grpc.version>1.64.0</io.grpc.version>
     </properties>
 
     <name>flagd</name>