[Android] update httpclient version, fix compilation issue in the sample (#9728)

* update httpclient version, fix compilation issue in the sample

* add new file

samples/client/petstore/android/httpclient/.openapi-generator/FILES

@@ -0,0 +1,34 @@
+.gitignore
+README.md
+build.gradle
+docs/ApiResponse.md
+docs/Category.md
+docs/Order.md
+docs/Pet.md
+docs/PetApi.md
+docs/StoreApi.md
+docs/Tag.md
+docs/User.md
+docs/UserApi.md
+git_push.sh
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+pom.xml
+settings.gradle
+src/main/AndroidManifest.xml
+src/main/java/org/openapitools/client/ApiException.java
+src/main/java/org/openapitools/client/ApiInvoker.java
+src/main/java/org/openapitools/client/HttpPatch.java
+src/main/java/org/openapitools/client/JsonUtil.java
+src/main/java/org/openapitools/client/Pair.java
+src/main/java/org/openapitools/client/api/PetApi.java
+src/main/java/org/openapitools/client/api/StoreApi.java
+src/main/java/org/openapitools/client/api/UserApi.java
+src/main/java/org/openapitools/client/model/ApiResponse.java
+src/main/java/org/openapitools/client/model/Category.java
+src/main/java/org/openapitools/client/model/Order.java
+src/main/java/org/openapitools/client/model/Pet.java
+src/main/java/org/openapitools/client/model/Tag.java
+src/main/java/org/openapitools/client/model/User.java

samples/client/petstore/android/httpclient/.openapi-generator/VERSION

@@ -1 +1 @@
-4.0.0-SNAPSHOT
+5.2.0-SNAPSHOT