Fix govulncheck in CI

govulncheck is having trouble checking out the source due to
multiple Authorization headers. The fix for this is to not
persist the credentials.

Signed-off-by: Matt Farina <matt.farina@suse.com>

.github/workflows/govulncheck.yml

@@ -16,6 +16,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # pin@v6.0.1
+        with:
+          persist-credentials: false
       - name: Add variables to environment file
         run: cat ".github/env" >> "$GITHUB_ENV"
       - name: Setup Go