chore(deps)(deps): bump the spring group across 1 directory with 2 updates

Bumps the spring group with 2 updates in the / directory: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot) and [org.springframework.ai:spring-ai-bom](https://github.com/spring-projects/spring-ai).


Updates `org.springframework.boot:spring-boot-starter-parent` from 4.0.5 to 4.0.6
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.5...v4.0.6)

Updates `org.springframework.ai:spring-ai-bom` from 2.0.0-M3 to 2.0.0-M4
- [Release notes](https://github.com/spring-projects/spring-ai/releases)
- [Commits](spring-projects/spring-ai@v2.0.0-M3...v2.0.0-M4)

---
updated-dependencies:
- dependency-name: org.springframework.ai:spring-ai-bom
  dependency-version: 2.0.0-M4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: spring
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: spring
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>4.0.5</version>
+        <version>4.0.6</version>
         <relativePath/>
     </parent>
 
@@ -23,7 +23,7 @@
     <properties>
         <java.version>25</java.version>
         <neo4j.version>2026.04.0</neo4j.version>
-        <spring-ai.version>2.0.0-M3</spring-ai.version>
+        <spring-ai.version>2.0.0-M4</spring-ai.version>
         <picocli.version>4.7.7</picocli.version>
         <jacoco.version>0.8.14</jacoco.version>
         <spotbugs.version>4.9.8.3</spotbugs.version>