Upgrade golangci-lint

1.42 seems to be having some problems with Go 1.18 (see #2649), so let's
just upgrade to latest.  There was one new error, suggesting to use `%q`
rather than `"%s"`, since the former does escapes properly.  It doesn't
really matter for us -- the string should be an identifier -- but it
doesn't hurt.  (Plus it wanted us to upgrade from ioutil, which I did
in #181.)

Test plan: make check

.github/workflows/go.yml

@@ -42,4 +42,4 @@ jobs:
     - name: Run lint
       uses: golangci/golangci-lint-action@v2
       with:
-        version: v1.42   # should match internal/lint/go.mod
+        version: v1.45   # should match internal/lint/go.mod

generate/types.go

@@ -484,7 +484,7 @@ func (typ *goInterfaceType) WriteDefinition(w io.Writer, g *generator) error {
 					"(see interface doc for possible values).", methodName)
 		} else {
 			description = fmt.Sprintf(
-				`%s returns the interface-field "%s" from its implementation.`,
+				`%s returns the interface-field %q from its implementation.`,
 				methodName, sharedField.GraphQLName)
 			if sharedField.Description != "" {
 				description = fmt.Sprintf(

internal/lint/go.mod

@@ -1,6 +1,6 @@
 module github.com/Khan/genqlient/internal/lint
 
-go 1.14
+go 1.16
 
 // Should match golangci-lint version in .github/workflows/go.yml
-require github.com/golangci/golangci-lint v1.42.0
+require github.com/golangci/golangci-lint v1.45.0