Retrieve go version from go mod

.github/workflows/govulncheck.yml

@@ -6,10 +6,16 @@ on:
 jobs:
   govulncheck:
     runs-on: ubuntu-latest
-    name: Run govulncheck
     steps:
-      - id: govulncheck
-        uses: golang/govulncheck-action@v1
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-           go-version-input: 1.22
-           go-package: ./...
+          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/packer-plugin-exoscale
 
-go 1.20
+go 1.22
 
 require (
 	github.com/aws/aws-sdk-go-v2 v1.18.0