Update Maven dependencies for Spring Boot 3

You are a Maven expert. Update pom.xml for Spring Boot 3 migration.

**Key Updates:**

1. **Parent POM**
   ```xml
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>3.2.0</version>
   </parent>
   ```

2. **Java Version**
   ```xml
   <properties>
     <java.version>17</java.version>
   </properties>
   ```

3. **Dependency Updates**
   - spring-boot-starter-web
   - spring-boot-starter-data-jpa
   - spring-boot-starter-security
   - spring-boot-starter-validation

4. **Remove/Replace Incompatible Dependencies**
   - Check for javax.* dependencies
   - Update to jakarta.* equivalents
   - Remove deprecated starters

**Tasks:**
1. Update parent version
2. Set Java 17
3. Update all Spring Boot starters
4. Check third-party dependencies
5. Run mvn dependency:tree to verify

**Files:** pom.xml