build(deps): bump the minor-and-patch group across 1 directory with 2 updates (#235)

Bumps the minor-and-patch group with 2 updates in the / directory:
[com.google.protobuf:protoc](https://github.com/protocolbuffers/protobuf)
and
[com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf).

Updates `com.google.protobuf:protoc` from 4.27.4 to 4.28.0
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Updates `com.google.protobuf:protobuf-java` from 4.27.4 to 4.28.0
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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -64,7 +64,7 @@ protobuf {
         // The version of protoc must match protobuf-java. If you don't depend on
         // protobuf-java directly, you will be transitively depending on the
         // protobuf-java version that grpc depends on.
-        artifact = "com.google.protobuf:protoc:4.27.4"
+        artifact = "com.google.protobuf:protoc:4.28.0"
     }
     plugins {
         grpc {
@@ -126,7 +126,7 @@ dependencies {
     // Explicit matching of protobuf-java and protoc versions to address
     // compilation errors arising due to transitive dependency on the version of 
     // protobuf-java that grpc depends on. 
-    implementation "com.google.protobuf:protobuf-java:4.27.4"
+    implementation "com.google.protobuf:protobuf-java:4.28.0"
 
     testImplementation "io.opencensus:opencensus-api:${openCensusVersion}"
     testImplementation "io.opencensus:opencensus-exporter-trace-jaeger:${openCensusVersion}"