chore(deps): update dependency com.google.auto.value:auto-value to v1.7.5

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.auto.value:auto-value	1.4 -> 1.7.5
com.google.auto.value:auto-value	1.7.4 -> 1.7.5

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[codecov]

Codecov Report

Merging #1333 (d3db5e7) into master (20f6ecf) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1333      +/-   ##
============================================
+ Coverage     80.34%   80.37%   +0.03%     
- Complexity     1331     1332       +1     
============================================
  Files           210      210              
  Lines          5682     5682              
  Branches        519      519              
============================================
+ Hits           4565     4567       +2     
+ Misses          912      911       -1     
+ Partials        205      204       -1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/google/api/gax/batching/BatcherImpl.java	96.06% <0.00%> (+1.12%)	23.00% <0.00%> (+1.00%)

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