Gremlin-Go: testify version bump to 1.7.2 for vulnerability in its dependency

[xiazcy]

Testify is used for testing in gremlin-go, they fixed a security vulnerability inside its dependency. Bumping to the resolved version in gremlin-go.

[codecov-commenter]

Codecov Report

Merging #1763 (5418450) into 3.5-dev (137cad0) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           3.5-dev    #1763      +/-   ##
===========================================
- Coverage    63.58%   63.50%   -0.09%     
===========================================
  Files           23       23              
  Lines         3636     3636              
===========================================
- Hits          2312     2309       -3     
- Misses        1145     1147       +2     
- Partials       179      180       +1     

Impacted Files	Coverage Δ
gremlin-go/driver/gorillaTransporter.go	64.15% <0.00%> (-2.84%)	⬇️

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