Bump org.springframework.boot from 2.5.2 to 3.0.0 in /examples

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 2.5.2 to 3.0.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.5.2...v3.0.0)

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

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

Author: dependabot[bot]

examples/selenium-container/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '2.5.2'
+    id 'org.springframework.boot' version '3.0.0'
 }
 apply plugin: 'io.spring.dependency-management'
 

examples/spring-boot-kotlin-redis/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id("org.springframework.boot") version "2.5.2"
+    id("org.springframework.boot") version "3.0.0"
     id("org.jetbrains.kotlin.jvm") version "1.5.10"
     id("org.jetbrains.kotlin.plugin.spring") version "1.5.21"
 }

examples/spring-boot/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '2.5.2'
+    id 'org.springframework.boot' version '3.0.0'
 }
 apply plugin: 'io.spring.dependency-management'