fix: update an invalid check in golangci-lint govet config (#1269)

This fixes an invalid check that's listed under golangci-lint's govet
config, which is causing lint failures in CI.

Author: tchung1118

.golangci.yml

@@ -28,7 +28,7 @@ linters-settings:
   govet:
     # These govet checks are disabled by default, but they're useful.
     enable:
-      - niliness
+      - nilness
       - reflectvaluecompare
       - sortslice
       - unusedwrite