fetch origin before diff checks

Signed-off-by: Per Goncalves da Silva <[email protected]>

Author: Per Goncalves da Silva

scripts/e2e_test_fixtures.sh

@@ -64,6 +64,7 @@ function check_changes() {
   OPM_CHANGED=false
   FIXTURES_CHANGED=false
 
+  git fetch origin "${TARGET_BRANCH}" --depth=2
   if git diff "origin/${TARGET_BRANCH}" -- go.mod | grep -E '^\+[[:space:]]+github.com/operator-framework/operator-registry' > /dev/null; then
     OPM_CHANGED=true
   fi