Release/v2.2.0 (#191)

## Description

### Why is this change being made?

1. Preparing for 2.2.0 release


### What is changing?

1. Version bumped from 2.1.1 to 2.2.0 in pom.xml and README.md


### Related Links
- **Issue #, if available**:

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## Testing

### How was this tested?

1. `mvn clean install`

### When testing locally, provide testing artifact(s):

1. Generated artifact:
`target/aws-secretsmanager-caching-java-2.2.0.jar`

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## Reviewee Checklist

**Update the checklist after submitting the PR**

- [x] I have reviewed, tested and understand all changes
  *If not, why:*
- [x] I have filled out the Description and Testing sections above
  *If not, why:*
- [x] Build and Unit tests are passing
  *If not, why:*
- [x] Unit test coverage check is passing
  *If not, why:*
- [x] I have ensured no sensitive information is leaking (i.e., no
logging of sensitive fields, or otherwise)
  *If not, why:*
- [x] I have added explanatory comments for complex logic, new
classes/methods and new tests
  *If not, why:*
- [x] I have updated README/documentation (if needed)
  *If not, why:*
- [x] I have clearly called out breaking changes (if any)
  *If not, why:*

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## Reviewer Checklist

**All reviewers please ensure the following are true before reviewing:**

- Reviewee checklist has been accurately filled out
- Code changes align with stated purpose in description
- Test coverage adequately validates the changes

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By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

---------

Co-authored-by: Vedant Jaiswal <vedjasy@amazon.com>

Author: vedant-jaiswal

README.md

@@ -30,7 +30,7 @@ You can get the latest release from Maven:
 <dependency>
   <groupId>com.amazonaws.secretsmanager</groupId>
   <artifactId>aws-secretsmanager-caching-java</artifactId>
-  <version>2.0.0</version>
+  <version>2.2.0</version>
 </dependency>
 ```
 

pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>com.amazonaws.secretsmanager</groupId>
     <artifactId>aws-secretsmanager-caching-java</artifactId>
-    <version>2.1.1</version>
+    <version>2.2.0</version>
     <packaging>jar</packaging>