Bump grpc-auth from 1.39.0 to 1.44.1 (#551)

Bumps [grpc-auth](https://github.com/grpc/grpc-java) from 1.39.0 to 1.44.1.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.39.0...v1.44.1)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-auth
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gcp-tracing/build.gradle

@@ -12,7 +12,7 @@ dependencies {
 
     implementation'io.zipkin.gcp:zipkin-sender-stackdriver:1.0.2'
     implementation 'io.zipkin.gcp:brave-propagation-stackdriver:1.0.4'
-    implementation 'io.grpc:grpc-auth:1.39.0'
+    implementation 'io.grpc:grpc-auth:1.44.1'
 
     implementation 'io.grpc:grpc-netty-shaded:1.44.1'
     implementation "io.opentracing.brave:brave-opentracing:1.0.0"