Fix typo in MySQL 8.4 Dockerfile

Author: GrahamCampbell

docker/vttestserver/Dockerfile.mysql84

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM --platform=linux/amd64 golang:1.23.4-bullseye AS builder
+FROM --platform=linux/amd64 golang:1.23.5-bullseye AS builder
 
 # Allows docker builds to set the BUILD_NUMBER
 ARG BUILD_NUMBER