Update build configuration for Spring Boot 4

- Pin spring-retry to version 2.0.12 for compatibility
- Add Spring Boot 4 modular test starters:
  - spring-boot-starter-data-jpa-test
  - spring-boot-webmvc-test
  - spring-boot-jdbc-test

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: devondragon

build.gradle

@@ -49,7 +49,7 @@ dependencies {
     implementation 'com.google.guava:guava:33.5.0-jre'
     implementation 'org.apache.commons:commons-text:1.14.0'
     compileOnly 'jakarta.validation:jakarta.validation-api:3.1.1'
-    compileOnly 'org.springframework.retry:spring-retry'
+    compileOnly 'org.springframework.retry:spring-retry:2.0.12'
 
     // Lombok dependencies
     compileOnly "org.projectlombok:lombok:$lombokVersion"
@@ -69,10 +69,15 @@ dependencies {
     testImplementation 'org.springframework.boot:spring-boot-starter-security'
     testImplementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
     testImplementation 'org.springframework.security:spring-security-test'
-    testImplementation 'org.springframework.retry:spring-retry'
+    testImplementation 'org.springframework.retry:spring-retry:2.0.12'
     testImplementation 'jakarta.validation:jakarta.validation-api:3.1.1'
     testImplementation 'com.h2database:h2:2.4.240'
 
+    // Spring Boot 4 test starters (modular test infrastructure)
+    testImplementation 'org.springframework.boot:spring-boot-starter-data-jpa-test'
+    testImplementation 'org.springframework.boot:spring-boot-webmvc-test'
+    testImplementation 'org.springframework.boot:spring-boot-jdbc-test'
+
     // Runtime dependencies moved to test scope for library
     testRuntimeOnly 'org.springframework.boot:spring-boot-devtools'
     testRuntimeOnly 'org.mariadb.jdbc:mariadb-java-client'