Fetch tags before determining new version

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

.github/workflows/sync-purls.yml

@@ -69,6 +69,7 @@ jobs:
         id: bump
         if: steps.regen_fst.outputs.changed == 'true'
         run: |-
+          git fetch --tags
           new_version=$(git tag --sort=version:refname | tail -n1 | awk -F'[v.]' '{ printf "%d.%d.0", $2, $3+1 }')
 
           echo "new_version=$new_version" >> $GITHUB_OUTPUT