build(deps): bump maven in /deploy/docker

Bumps maven from 3.8-eclipse-temurin-17 to 3.9-eclipse-temurin-17.

---
updated-dependencies:
- dependency-name: maven
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

deploy/docker/Dockerfile

@@ -11,7 +11,7 @@ RUN jlink --add-modules java.base,java.compiler,java.datatransfer,java.desktop,j
 ##
 ## Build Openblocks api-service application
 ##
-FROM maven:3.8-eclipse-temurin-17 AS build-api-service
+FROM maven:3.9-eclipse-temurin-17 AS build-api-service
 COPY ./server/api-service /openblocks-server
 WORKDIR /openblocks-server
 RUN --mount=type=cache,target=/root/.m2 mvn -f pom.xml clean package -DskipTests