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/float.go

@@ -1,9 +1,11 @@
 package graphql
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
+	"math"
 	"strconv"
 )
 
@@ -29,3 +31,17 @@ func UnmarshalFloat(v interface{}) (float64, error) {
 		return 0, fmt.Errorf("%T is not an float", v)
 	}
 }
+
+func MarshalFloatContext(f float64) ContextMarshaler {
+	return ContextWriterFunc(func(ctx context.Context, w io.Writer) error {
+		if math.IsInf(f, 0) || math.IsNaN(f) {
+			return fmt.Errorf("cannot marshal infinite no NaN float values")
+		}
+		io.WriteString(w, fmt.Sprintf("%g", f))
+		return nil
+	})
+}
+
+func UnmarshalFloatContext(ctx context.Context, v interface{}) (float64, error) {
+	return UnmarshalFloat(v)
+}