Update Gradle to 6.5.1

[anuraaga]

Ran into this seemingly buggy Gradle behavior

gradle/gradle#8489

Updating fixed it for me

[codecov]

Codecov Report

Merging #1488 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1488      +/-   ##
============================================
- Coverage     92.50%   92.44%   -0.06%     
  Complexity      938      938              
============================================
  Files           117      117              
  Lines          3348     3348              
  Branches        270      270              
============================================
- Hits           3097     3095       -2     
- Misses          170      171       +1     
- Partials         81       82       +1     

Impacted Files	Coverage Δ	Complexity Δ
...telemetry/sdk/trace/export/BatchSpanProcessor.java	94.59% <0.00%> (-1.36%)	8.00% <0.00%> (ø%)

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