fix(kotlin-spring): replace legacy oauth2 starter and add Jackson exclusivity tests

Replace deprecated spring-cloud-starter-oauth2:2.2.5.RELEASE with
spring-boot-starter-oauth2-client in SB4 templates, as the legacy
starter is pre-Jakarta and incompatible with Spring Boot 4.

Add negative assertions to Jackson dependency tests to ensure Jackson 2
and Jackson 3 artifacts are mutually exclusive.

Author: yonatankarp

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/buildGradle-sb4-Kts.mustache

@@ -66,7 +66,7 @@ dependencies {
 {{/useJackson3}}
 
     implementation("org.springframework.cloud:spring-cloud-starter-openfeign"){{#hasAuthMethods}}
-        implementation("org.springframework.cloud:spring-cloud-starter-oauth2:2.2.5.RELEASE"){{/hasAuthMethods}}
+        implementation("org.springframework.boot:spring-boot-starter-oauth2-client"){{/hasAuthMethods}}
 
 {{#useBeanValidation}}
     implementation("jakarta.validation:jakarta.validation-api"){{/useBeanValidation}}

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/pom-sb4.mustache

@@ -179,11 +179,8 @@
         </dependency>
         {{#hasAuthMethods}}
         <dependency>
-            <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-oauth2</artifactId>
-            {{^parentOverridden}}
-                <version>2.2.5.RELEASE</version>
-            {{/parentOverridden}}
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
         </dependency>
         {{/hasAuthMethods}}
         <dependency>

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-declarative-http-interface/buildGradle-sb4-Kts.mustache

@@ -66,7 +66,7 @@ dependencies {
 {{/useJackson3}}
 
 {{#hasAuthMethods}}
-    implementation("org.springframework.cloud:spring-cloud-starter-oauth2:2.2.5.RELEASE"){{/hasAuthMethods}}
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-client"){{/hasAuthMethods}}
 
 {{#useBeanValidation}}
     implementation("jakarta.validation:jakarta.validation-api"){{/useBeanValidation}}

modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-declarative-http-interface/pom-sb4.mustache

@@ -175,11 +175,8 @@
         </dependency>
         {{#hasAuthMethods}}
         <dependency>
-            <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-starter-oauth2</artifactId>
-            {{^parentOverridden}}
-                <version>2.2.5.RELEASE</version>
-            {{/parentOverridden}}
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
         </dependency>
         {{/hasAuthMethods}}
         <dependency>

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java

@@ -4868,6 +4868,8 @@ public void shouldGenerateSpringBoot4PomWithJackson3Deps() throws IOException {
         assertFileContains(pomPath, "tools.jackson.dataformat");
         assertFileContains(pomPath, "tools.jackson.module");
         assertFileNotContains(pomPath, "jackson-datatype-jsr310");
+        assertFileNotContains(pomPath, "com.fasterxml.jackson.dataformat");
+        assertFileNotContains(pomPath, "com.fasterxml.jackson.module");
     }
 
     @Test
@@ -4898,6 +4900,8 @@ public void shouldGenerateSpringBoot4PomWithJackson2Deps() throws IOException {
         assertFileContains(pomPath, "4.0.1");
         assertFileContains(pomPath, "com.fasterxml.jackson.dataformat");
         assertFileContains(pomPath, "jackson-datatype-jsr310");
+        assertFileNotContains(pomPath, "tools.jackson.dataformat");
+        assertFileNotContains(pomPath, "tools.jackson.module");
     }
 }