deps: stick to github.com/vektah/gqlparser/v2@v2.5.30 (#1744)

Because the latest version would require a change to OPA's YAML
test cases. For projects that use both Regal and OPA, like EOPA,
it's better to have OPA control the version of third party libs.

The extra field that v2.5.31 returns is `ExpectedTypeHasDefault`,
introduced in
vektah/gqlparser@5b41269

Signed-off-by: Stephan Renatus <stephan.renatus@gmail.com>

Author: srenatus

go.mod

@@ -112,7 +112,7 @@ require (
 	github.com/tchap/go-patricia/v2 v2.3.3 // indirect
 	github.com/tmccombs/hcl2json v0.6.7 // indirect
 	github.com/valyala/fastjson v1.6.4 // indirect
-	github.com/vektah/gqlparser/v2 v2.5.31 // indirect
+	github.com/vektah/gqlparser/v2 v2.5.30 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect

go.sum

@@ -348,6 +348,8 @@ github.com/tmccombs/hcl2json v0.6.7/go.mod h1:lJgBOOGDpbhjvdG2dLaWsqB4KBzul2Hytf
 github.com/urfave/cli/v2 v2.2.0/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
 github.com/valyala/fastjson v1.6.4 h1:uAUNq9Z6ymTgGhcm0UynUAB6tlbakBrz6CQFax3BXVQ=
 github.com/valyala/fastjson v1.6.4/go.mod h1:CLCAqky6SMuOcxStkYQvblddUtoRxhYMGLrsQns1aXY=
+github.com/vektah/gqlparser/v2 v2.5.30 h1:EqLwGAFLIzt1wpx1IPpY67DwUujF1OfzgEyDsLrN6kE=
+github.com/vektah/gqlparser/v2 v2.5.30/go.mod h1:D1/VCZtV3LPnQrcPBeR/q5jkSQIPti0uYCP/RI0gIeo=
 github.com/vektah/gqlparser/v2 v2.5.31 h1:YhWGA1mfTjID7qJhd1+Vxhpk5HTgydrGU9IgkWBTJ7k=
 github.com/vektah/gqlparser/v2 v2.5.31/go.mod h1:c1I28gSOVNzlfc4WuDlqU7voQnsqI6OG2amkBAFmgts=
 github.com/vmihailenco/msgpack/v4 v4.3.12/go.mod h1:gborTTJjAo/GWTqqRjrLCn9pgNN+NXzzngzBKDPIqw4=