Support Go 1.18: Upgrade gqlgen to v0.17.2 (#2443)

* Upgrade gqlgen to v0.17.2

This enables builds on Go 1.18. github.com/vektah/gqlparser is upgraded
to the newest version too.

Getting this to work is a bit of a hazzle. I had to first remove
vendoring from the repository, perform the upgrade and then re-introduce
the vendor directory. I think gqlgens analysis went wrong for some
reason on the upgrade. It would seem a clean-room installation fixed it.

* Bump project to 1.18

* Update all packages, address gqlgenc breaking changes

* Let `go mod tidy` handle the go.mod file

* Upgrade linter to 1.45.2

* Introduce v1.45.2 of the linter

The linter now correctly warns on `strings.Title` because it isn't
unicode-aware. Fix this by using the suggested fix from x/text/cases
to produce unicode-aware strings.

The mapping isn't entirely 1-1 as this new approach has a larger iface:
it spans all of unicode rather than just ASCII. It coincides for ASCII
however, so things should be largely the same.

* Ready ourselves for errchkjson and contextcheck.

* Revert dockerfile golang version changes for now

Co-authored-by: Kermie <kermie@isinthe.house>
Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

vendor/github.com/99designs/gqlgen/graphql/handler/server.go

@@ -74,6 +74,11 @@ func (s *Server) AroundFields(f graphql.FieldMiddleware) {
 	s.exec.AroundFields(f)
 }
 
+// AroundRootFields is a convenience method for creating an extension that only implements field middleware
+func (s *Server) AroundRootFields(f graphql.RootFieldMiddleware) {
+	s.exec.AroundRootFields(f)
+}
+
 // AroundOperations is a convenience method for creating an extension that only implements operation middleware
 func (s *Server) AroundOperations(f graphql.OperationMiddleware) {
 	s.exec.AroundOperations(f)