build(deps): bump eclipse-temurin (#471)

Bumps eclipse-temurin from 17-jdk-alpine to 21-jdk-alpine.

---
updated-dependencies:
- dependency-name: eclipse-temurin
  dependency-type: direct:production
...

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

examples-ca/example-r2dbc/deployment/Dockerfile

@@ -1,4 +1,4 @@
-FROM eclipse-temurin:17-jdk-alpine
+FROM eclipse-temurin:21-jdk-alpine
 VOLUME /tmp
 COPY r2dbc-example.jar app.jar
 ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=70 -Djava.security.egd=file:/dev/./urandom"