Bump tomcat in /geoserver (#107)

Bumps tomcat from 9.0.113-jre21-temurin to 9.0.115-jre21-temurin.

---
updated-dependencies:
- dependency-name: tomcat
  dependency-version: 9.0.115-jre21-temurin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

geoserver/Dockerfile

@@ -5,7 +5,7 @@ COPY maven/ /tmp/
 
 RUN mvn -U clean package --fail-at-end --settings .mvn/settings.xml
 
-FROM tomcat:9.0.113-jre21-temurin AS geoserver
+FROM tomcat:9.0.115-jre21-temurin AS geoserver
 
 LABEL org.opencontainers.image.authors="Tailormap/core-developers" \
       org.opencontainers.image.description="A GeoServer image for the Tailormap stack" \