Bump spring-boot-starter-web in /it/spring-boot-with-jib (#1538)

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.3.3.RELEASE to 2.5.12.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.3.3.RELEASE...v2.5.12)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
...

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it/spring-boot-with-jib/pom.xml

@@ -33,7 +33,7 @@
     <docker.user>fabric8</docker.user>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
-    <spring.version>2.3.3.RELEASE</spring.version>
+    <spring.version>2.5.12</spring.version>
   </properties>
 
   <dependencies>