refine AuthUtils.getPrivateKey()

[JacksonTian]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.16%. Comparing base (f8cf820) to head (c12a697).

Files	Patch %	Lines
...ava/com/aliyuncs/auth/OIDCCredentialsProvider.java	33.33%	1 Missing and 1 partial ⚠️
...re/src/main/java/com/aliyuncs/utils/AuthUtils.java	84.61%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #928      +/-   ##
============================================
+ Coverage     90.06%   90.16%   +0.09%     
  Complexity     1649     1649              
============================================
  Files           123      123              
  Lines          4749     4736      -13     
  Branches        537      536       -1     
============================================
- Hits           4277     4270       -7     
+ Misses          346      342       -4     
+ Partials        126      124       -2     

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