Setup CodeQL CI job with Go 1.18

Signed-off-by: Adrien Fillon <adrien.fillon@manomano.com>

.github/workflows/scan.yaml

@@ -54,6 +54,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.18
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2
         with: