Bump spring.boot.version from 2.7.12 to 3.4.0

Bumps `spring.boot.version` from 2.7.12 to 3.4.0.

Updates `org.springframework.boot:spring-boot-starter` from 2.7.12 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.12...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-test` from 2.7.12 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.12...v3.4.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

spring-boot-starter-liquibase-couchbase-test/pom.xml

@@ -17,7 +17,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
-        <spring.boot.version>2.7.12</spring.boot.version>
+        <spring.boot.version>3.4.0</spring.boot.version>
         <couchbase.version>1.17.6</couchbase.version>
         <lombok.version>1.18.26</lombok.version>
         <snakeyaml.version>2.0</snakeyaml.version>