Change `DeadLetterPublishingRecoverer` constructor signature to accept `? extends KafkaOperations`

[sh-cho]

Expected Behavior

@Bean
public DeadLetterPublishingRecoverer publisher(KafkaTemplate<?, ?> stringTemplate,
        KafkaTemplate<?, ?> bytesTemplate) {
    Map<Class<?>, KafkaTemplate<?, ?>> templates = new LinkedHashMap<>();
    templates.put(String.class, stringTemplate);
    templates.put(byte[].class, bytesTemplate);
    return new DeadLetterPublishingRecoverer(templates);
}

This should be ok

Current Behavior

$ ./gradlew build
...

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler output below.
  /.../config/KafkaConfig.java:161: error: no suitable constructor found for DeadLetterPublishingRecoverer(Map<Class<?>,KafkaTemplate<?,?>>)
          return new DeadLetterPublishingRecoverer(templates);
                 ^
      constructor DeadLetterPublishingRecoverer.DeadLetterPublishingRecoverer(KafkaOperations<? extends Object,? extends Object>) is not applicable
        (argument mismatch; Map<Class<?>,KafkaTemplate<?,?>> cannot be converted to KafkaOperations<? extends Object,? extends Object>)
      constructor DeadLetterPublishingRecoverer.DeadLetterPublishingRecoverer(Map<Class<?>,KafkaOperations<? extends Object,? extends Object>>) is not applicable
        (argument mismatch; Map<Class<?>,KafkaTemplate<?,?>> cannot be converted to Map<Class<?>,KafkaOperations<? extends Object,? extends Object>>)
  Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
  1 error

* Try:
> Check your code and dependencies to fix the compilation error(s)
> Run with --scan to get full insights.

BUILD FAILED in 981ms
1 actionable task: 1 executed

Compile error occurs, because constructor accept KafkaOperations as parameter. So In the example code above, templates type should be Map<Class<?>, KafkaOperations<?, ?>> templates = new LinkedHashMap<>(); for now.

This should be ? extends KafkaOperations so that KafkaTemplate can be a parameter.

Context

• Correct DeadLetterPublishingRecoverer example to use KafkaOperations #3911