Bump org.springframework.boot from 3.3.5 to 3.4.0 in /examples

Bumps org.springframework.boot from 3.3.5 to 3.4.0.

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

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

examples/aspectj/weaving/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id "org.jetbrains.kotlin.jvm"
-    id "org.springframework.boot" version "3.3.5"
+    id "org.springframework.boot" version "3.4.0"
     id "org.graalvm.buildtools.native" version "0.10.2"
 }