[kotlin-client] Update Gradle and dependencies (#18571)

* [kotlin] Target correct library in jvm-spring-webclient sample

* [kotlin] Fixed warning in jvm-spring-restclient

* [kotlin-client] Bump Gradle version

* [kotlin-client] enableFeaturePreview no longer needed as it's enabled by default

* [kotlin-client] Bump kotlin, spotless, and reactor versions

* [kotlin-client] Generated code

* [kotlin-client] Missed a generated sample

* [kotlin-client] Bumped gradle and java version in kotlin-client workflows

* [kotlin-client] First attempt to fix jvm-volley

* [kotlin-client] Use standard gradle action instead of custom one

* [kotlin-client] Use original gradlew action but without specific version

* [kotlin-client] Moved sample kotlin-spring-cloud to servers instead of clients

* [kotlin-client] Added previously missing generated file

* [kotlin-client] Corrected sample path

.github/workflows/samples-kotlin-client.yaml

@@ -10,9 +10,6 @@ on:
       - 'samples/client/petstore/kotlin*/**'
       - 'samples/client/others/kotlin-jvm-okhttp-parameter-tests/**'
 
-env:
-  GRADLE_VERSION: 6.9
-
 jobs:
   build:
     name: Build Kotlin client
@@ -65,7 +62,6 @@ jobs:
           - samples/client/echo_api/kotlin-jvm-spring-3-webclient
           - samples/client/petstore/kotlin-jvm-spring-3-restclient
           - samples/client/echo_api/kotlin-jvm-spring-3-restclient
-          - samples/client/petstore/kotlin-spring-cloud
           - samples/client/petstore/kotlin-name-parameter-mappings
           - samples/client/others/kotlin-jvm-okhttp-parameter-tests
     steps:
@@ -73,7 +69,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 8
+          java-version: 11
       - name: Cache maven dependencies
         uses: actions/cache@v4
         env:
@@ -85,7 +81,6 @@ jobs:
       - name: Install Gradle wrapper
         uses: eskatos/gradle-command-action@v3
         with:
-          gradle-version: ${{ env.GRADLE_VERSION }}
           build-root-directory: ${{ matrix.sample }}
           arguments: wrapper
       - name: Build

.github/workflows/samples-kotlin-echo-api.yaml

@@ -7,8 +7,7 @@ on:
   pull_request:
     paths:
       - samples/client/echo_api/kotlin**
-env:
-  GRADLE_VERSION: 7.4
+
 jobs:
   build:
     name: Build Kotlin Client JDK17
@@ -37,7 +36,6 @@ jobs:
       - name: Install Gradle wrapper
         uses: eskatos/gradle-command-action@v3
         with:
-          gradle-version: ${{ env.GRADLE_VERSION }}
           build-root-directory: ${{ matrix.sample }}
           arguments: wrapper
       - name: Setup node.js

.github/workflows/samples-kotlin-server.yaml

@@ -43,6 +43,7 @@ jobs:
           - samples/server/petstore/kotlin-server/javalin
           - samples/server/others/kotlin-server/jaxrs-spec
           - samples/server/others/kotlin-server/jaxrs-spec-array-response
+          - samples/server/petstore/kotlin-spring-cloud
           # comment out due to gradle build failure
           #- samples/server/petstore/kotlin-spring-default
           # no build.gradle file