go mod tidy and remove "toolchain go1.22.3"

Not sure why or who is adding this line, probably "go work init". I
don't know whether it would be useful, either.

Also, the version "go 1.22.0" was causing errors in CI [1]:

```
go: errors parsing go.mod:
/__w/jetstack-secure/jetstack-secure/go.mod:3: invalid go version '1.22.0': must match format 1.23
/__w/jetstack-secure/jetstack-secure/go.mod:5: unknown directive: toolchain
```

[1]: https://github.com/jetstack/jetstack-secure/actions/runs/10375056958/job/28723891036?pr=552

go.mod

@@ -2,7 +2,7 @@ module github.com/jetstack/preflight
 
 go 1.22.0
 
-toolchain go1.22.3
+toolchain go1.22.6
 
 require (
 	github.com/Jeffail/gabs/v2 v2.7.0
@@ -22,6 +22,7 @@ require (
 	github.com/prometheus/client_golang v1.19.1
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.9.0
 	gopkg.in/d4l3k/messagediff.v1 v1.2.1
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.30.2
@@ -32,25 +33,24 @@ require (
 )
 
 require (
+	github.com/Khan/genqlient v0.7.0 // indirect
 	github.com/Venafi/vcert/v5 v5.7.1 // indirect
 	github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/blang/semver/v4 v4.0.0 // indirect
 	github.com/evanphx/json-patch/v5 v5.9.0 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
-	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
 	github.com/go-http-utils/headers v0.0.0-20181008091004-fed159eddc2a // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/google/cel-go v0.17.8 // indirect
 	github.com/google/gnostic-models v0.6.9-0.20230804172637-c7be7c783f49 // indirect
 	github.com/gorilla/css v1.0.0 // indirect
-	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
+	github.com/gorilla/websocket v1.5.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/sosodev/duration v1.2.0 // indirect
 	github.com/stoewer/go-strcase v1.3.0 // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
-	github.com/x448/float16 v0.8.4 // indirect
+	github.com/vektah/gqlparser/v2 v2.5.15 // indirect
 	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
@@ -61,7 +61,6 @@ require (
 	gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20240125205218-1f4bbc51befe // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240125205218-1f4bbc51befe // indirect
-	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	k8s.io/apiextensions-apiserver v0.30.2 // indirect
 	k8s.io/apiserver v0.30.2 // indirect
@@ -101,14 +100,12 @@ require (
 	golang.org/x/term v0.21.0 // indirect
 	golang.org/x/text v0.16.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/klog/v2 v2.130.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20240430033511-f0e62f92d13f // indirect
-	k8s.io/kubernetes v1.30.3
 	k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
-	sigs.k8s.io/structured-merge-diff/v4 v4.4.1
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
 )