chore: remove unused image tag in .OwlBot-hermetic.yaml (#2333)

This removes the unused image tag in this file. Part of the cleanup after enabling Hermetic Library generation in this repo.

Newline at EOF automatically added - see [this SO](https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline).

.github/.OwlBot-hermetic.yaml

@@ -11,10 +11,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-docker:
-  image: "gcr.io/cloud-devrel-public-resources/owlbot-java:latest"
-
 deep-remove-regex:
 - "/grpc-google-.*/src"
 - "/proto-google-.*/src"
@@ -34,4 +30,4 @@ deep-copy-regex:
 - source: "/google/bigtable/admin/(v\\d)/.*-java/grpc-google-.*/src"
   dest: "/owl-bot-staging/$1/grpc-google-cloud-bigtable-admin-$1/src"
 - source: "/google/bigtable/admin/(v\\d)/.*-java/gapic-google-.*/src"
-  dest: "/owl-bot-staging/$1/google-cloud-bigtable/src"
+  dest: "/owl-bot-staging/$1/google-cloud-bigtable/src"

README.md

@@ -50,7 +50,7 @@ If you are using Maven without the BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.44.0')
+implementation platform('com.google.cloud:libraries-bom:26.45.0')
 
 implementation 'com.google.cloud:google-cloud-bigtable'
 ```