Fix usage of javax.annotation (#6645)

* Fix usage of javax.annotation:javax.annotation-api

* Regenerate samples

```
bin/generate-samples.sh bin/configs/java-* bin/configs/jaxrs-* bin/configs/spring-* bin/configs/kotlin-* bin/configs/other/java-* bin/configs/other/jaxrs-* bin/configs/other/kotlin-* bin/configs/other/openapi3/jaxrs-cxf-client.yaml bin/configs/other/openapi3/kotlin-*
```

samples/server/petstore/java-play-framework-async/app/apimodels/Category.java

@@ -8,7 +8,7 @@ import javax.validation.constraints.*;
 /**
  * A category for a pet
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class Category   {
   @JsonProperty("id")

samples/server/petstore/java-play-framework-async/app/apimodels/ModelApiResponse.java

@@ -8,7 +8,7 @@ import javax.validation.constraints.*;
 /**
  * Describes the result of uploading an image resource
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class ModelApiResponse   {
   @JsonProperty("code")

samples/server/petstore/java-play-framework-async/app/apimodels/Order.java

@@ -9,7 +9,7 @@ import javax.validation.constraints.*;
 /**
  * An order for a pets from the pet store
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class Order   {
   @JsonProperty("id")

samples/server/petstore/java-play-framework-async/app/apimodels/Pet.java

@@ -12,7 +12,7 @@ import javax.validation.constraints.*;
 /**
  * A pet for sale in the pet store
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class Pet   {
   @JsonProperty("id")

samples/server/petstore/java-play-framework-async/app/apimodels/Tag.java

@@ -8,7 +8,7 @@ import javax.validation.constraints.*;
 /**
  * A tag for a pet
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class Tag   {
   @JsonProperty("id")

samples/server/petstore/java-play-framework-async/app/apimodels/User.java

@@ -8,7 +8,7 @@ import javax.validation.constraints.*;
 /**
  * A User who is purchasing from the pet store
  */
-
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaPlayFrameworkCodegen")
 @SuppressWarnings({"UnusedReturnValue", "WeakerAccess"})
 public class User   {
   @JsonProperty("id")