Run govulncheck in PRs (#18)

# Description
<!--
* Prefix: the title with the component name being changed. Add a short
and self describing sentence to ease the review
* Please add a few lines providing context and describing the change
* Please self comment changes whenever applicable to help with the
review process
* Please keep the checklist as part of the PR. Tick what applies to this
change.
-->

## Checklist
(For exoscale contributors)

* [ ] Changelog updated (under *Unreleased* block)
* [ ] Integration testing

## Testing

<!--
Describe the tests you did
-->

.github/workflows/govulncheck.yml

@@ -0,0 +1,21 @@
+name: govulncheck
+
+on:
+  pull_request:
+
+jobs:
+  govulncheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+          cache-dependency-path: 'go.sum'
+          check-latest: true
+      - name: Install govulncheck
+        run: go install golang.org/x/vuln/cmd/govulncheck@latest
+        shell: bash
+      - name: Run govulncheck
+        run: govulncheck ./...
+        shell: bash

go.mod

@@ -1,6 +1,6 @@
 module github.com/exoscale/cert-manager-webhook-exoscale
 
-go 1.20
+go 1.22
 
 require (
 	github.com/cert-manager/cert-manager v1.13.2
@@ -77,21 +77,21 @@ require (
 	go.opentelemetry.io/otel/trace v1.19.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.25.0 // indirect
-	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/oauth2 v0.12.0 // indirect
 	golang.org/x/sync v0.3.0 // indirect
-	golang.org/x/term v0.13.0 // indirect
-	golang.org/x/text v0.13.0 // indirect
+	golang.org/x/term v0.18.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.13.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20230803162519-f966b187b2e5 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230911183012-2d3300fd4832 // indirect
 	google.golang.org/grpc v1.58.3 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
@@ -112,8 +112,8 @@ require (
 	github.com/exoscale/egoscale v0.90.0
 	github.com/go-logr/logr v1.2.4 // indirect
 	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
 	k8s.io/klog/v2 v2.100.1 // indirect
 	k8s.io/kube-aggregator v0.28.1 // indirect
 	sigs.k8s.io/controller-runtime v0.16.1 // indirect