ci: rebase specified s-v pr

So that CI does not fail, if suricata PR got upgraded in a new
version, but S-V PR did not get upgraded, and S-V changed
in master

(cherry picked from commit 3e81d20)

.github/workflows/builds.yml

@@ -94,11 +94,12 @@ jobs:
           tar zcf suricata-update.tar.gz suricata-update
       - name: Fetching suricata-verify
         run: |
-          git clone --depth 1 ${sv_repo} -b ${sv_branch} suricata-verify
+          git clone ${sv_repo} -b ${sv_branch} suricata-verify
           if [[ "${sv_pr}" != "" ]]; then
               cd suricata-verify
               git fetch origin pull/${sv_pr}/head:prep
               git checkout prep
+              git rebase ${DEFAULT_SV_BRANCH}
               cd ..
           fi
           tar zcf suricata-verify.tar.gz suricata-verify