fix: update @google-cloud/common to ^0.31.0

[DominicKramer]

No description provided.

[codecov]

Codecov Report

Merging #639 into master will decrease coverage by <.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #639      +/-   ##
==========================================
- Coverage   92.89%   92.89%   -0.01%     
==========================================
  Files          38       38              
  Lines        3546     3545       -1     
  Branches      105      105              
==========================================
- Hits         3294     3293       -1     
  Misses        229      229              
  Partials       23       23

Impacted Files	Coverage Δ
test/test-controller.ts	100% <ø> (ø)	⬆️
test/auth-request.ts	80% <75%> (-3.34%)	⬇️

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