chore(deps): bump github.com/vektah/gqlparser/v2 from 2.5.5 to 2.5.6

Bumps [github.com/vektah/gqlparser/v2](https://github.com/vektah/gqlparser) from 2.5.5 to 2.5.6.
- [Release notes](https://github.com/vektah/gqlparser/releases)
- [Commits](https://github.com/vektah/gqlparser/compare/v2.5.5...v2.5.6)

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/rs/cors v1.9.0
 	github.com/sparetimecoders/goamqp v0.1.4
 	github.com/stretchr/testify v1.8.4
-	github.com/vektah/gqlparser/v2 v2.5.5
+	github.com/vektah/gqlparser/v2 v2.5.6
 	github.com/wundergraph/graphql-go-tools v1.63.2
 	gitlab.com/unboundsoftware/eventsourced/amqp v1.6.4
 	gitlab.com/unboundsoftware/eventsourced/eventsourced v1.13.0

go.sum

@@ -158,8 +158,8 @@ github.com/tj/go-kinesis v0.0.0-20171128231115-08b17f58cb1b/go.mod h1:/yhzCV0xPf
 github.com/tj/go-spin v1.1.0/go.mod h1:Mg1mzmePZm4dva8Qz60H2lHwmJ2loum4VIrLgVnKwh4=
 github.com/urfave/cli/v2 v2.25.5 h1:d0NIAyhh5shGscroL7ek/Ya9QYQE0KNabJgiUinIQkc=
 github.com/urfave/cli/v2 v2.25.5/go.mod h1:GHupkWPMM0M/sj1a2b4wUrWBPzazNrIjouW6fmdJLxc=
-github.com/vektah/gqlparser/v2 v2.5.5 h1:zZj0N2PtRGLBo+zw/IHOcUfK+8po1k5rb3O3Twe7tLM=
-github.com/vektah/gqlparser/v2 v2.5.5/go.mod h1:z8xXUff237NntSuH8mLFijZ+1tjV1swDbpDqjJmk6ME=
+github.com/vektah/gqlparser/v2 v2.5.6 h1:Ou14T0N1s191eRMZ1gARVqohcbe1e8FrcONScsq8cRU=
+github.com/vektah/gqlparser/v2 v2.5.6/go.mod h1:z8xXUff237NntSuH8mLFijZ+1tjV1swDbpDqjJmk6ME=
 github.com/wundergraph/graphql-go-tools v1.63.2 h1:ussoKVVy6r/sgvsGJRevlVuQSyETQQ/w0F77+OB408U=
 github.com/wundergraph/graphql-go-tools v1.63.2/go.mod h1:44QXSTiT0Jn82792Qjr7wHEJruC+RnofVJb5hM8Gins=
 github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=