Update to 2.1.0

[simonmarty]

Issue #, if available:

Description of changes:

• Update dependencies
• Fix user agent to match pom.xml
• Address new SpotBugs warnings

Error:  Medium: Shared primitive variable "refreshNeeded" in one thread may not yield the value of the most recent write from another thread [com.amazonaws.secretsmanager.caching.cache.SecretCacheObject] At SecretCacheObject.java:[line 207] AT_STALE_THREAD_WRITE_OF_PRIMITIVE
Error:  Low: Method intentionally throws RuntimeException. [com.amazonaws.secretsmanager.caching.cache.SecretCacheObject] At SecretCacheObject.java:[line 242] THROWS_METHOD_THROWS_RUNTIMEEXCEPTION

• Bump version number

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.90%. Comparing base (db8a853) to head (ce56898).
⚠️ Report is 1 commits behind head on v2.

Additional details and impacted files

@@             Coverage Diff              @@
##                 v2     #173      +/-   ##
============================================
+ Coverage     90.86%   90.90%   +0.03%     
  Complexity       90       90              
============================================
  Files             6        6              
  Lines           230      231       +1     
  Branches         24       24              
============================================
+ Hits            209      210       +1     
  Misses           18       18              
  Partials          3        3              

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