Bump gradle in /sensor_repository (#36)

Bumps gradle from 8.12.1-jdk21-jammy to 8.13-jdk21-jammy.

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

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

sensor_repository/Dockerfile

@@ -1,4 +1,4 @@
-FROM gradle:8.12.1-jdk21-jammy AS build
+FROM gradle:8.13-jdk21-jammy AS build
 COPY --chown=gradle:gradle . /home/gradle/src
 WORKDIR /home/gradle/src
 RUN gradle build --no-daemon -x test