Update .github/scripts/delete-old-cloudsmith-artifacts.sh

Co-authored-by: Marlon (Esolitos) Saglia <marlon@vespa.ai>

.github/scripts/delete-old-cloudsmith-artifacts.sh

@@ -29,7 +29,7 @@ if [[ -z "$VESPA_VERSIONS" ]]; then
 fi
 
 # Note: Allow the last Vespa 7 release to remain in the repo!
-VERSIONS_TO_DELETE=$(echo "${VESPA_VERSIONS}" | awk '/[0-9].*\.[0-9].*\.[0-9].*/{print $2}' | sort -V | grep -v "${LAST_VESPA_7_RELEASE}" | head -n -$MAX_NUMBER_OF_RELEASES)
+VERSIONS_TO_DELETE=$(echo "${VESPA_VERSIONS}" | awk '/[8-9]\.[0-9]+\.[0-9]+/{print $2}' | sort -V | head -n -$MAX_NUMBER_OF_RELEASES)
 if [[ -z "$VERSIONS_TO_DELETE" ]]; then
   echo "No old RPM versions to delete found. Exiting."
   exit 0