Bump the spring group across 4 directories with 1 update

Bumps the spring group with 1 update in the /labs/unicorn-stock-broker directory: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot).
Bumps the spring group with 1 update in the /labs/unicorn-store/software/alternatives/unicorn-audit-service directory: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot).
Bumps the spring group with 1 update in the /labs/unicorn-store/software/alternatives/unicorn-store-spring-graalvm directory: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot).
Bumps the spring group with 1 update in the /labs/unicorn-store/software/unicorn-store-spring directory: [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot).


Updates `org.springframework.boot:spring-boot-starter-parent` from 3.3.6 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.6...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-parent` from 3.3.6 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.6...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-parent` from 3.3.6 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.6...v3.4.0)

Updates `org.springframework.boot:spring-boot-starter-parent` from 3.3.6 to 3.4.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.6...v3.4.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: spring
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: spring
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: spring
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: spring
...

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

Author: dependabot[bot]

labs/unicorn-stock-broker/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.6</version>
+        <version>3.4.0</version>
     </parent>
     <groupId>com.unicorn</groupId>
     <artifactId>UnicornStockBroker</artifactId>

labs/unicorn-store/software/alternatives/unicorn-audit-service/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.6</version>
+        <version>3.4.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.unicorn</groupId>

labs/unicorn-store/software/alternatives/unicorn-store-spring-graalvm/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.6</version>
+        <version>3.4.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.unicorn</groupId>

labs/unicorn-store/software/unicorn-store-spring/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.6</version>
+        <version>3.4.0</version>
     </parent>
 
     <groupId>com.unicorn</groupId>