Fix syntax error in release pipeline

This will fix the release pipeline failing because of syntax error

/tekton/scripts/script-0-g58z4: line 18: syntax error near unexpected token `)'

Author: piyush-garg

.tekton/release-pipeline.yaml

@@ -72,7 +72,7 @@ spec:
                     exit
                 }
                 stable_tag=${version%.*}.x
-                alltags=$(for i in $(git tag -l|grep '^v'|sort -rn);do echo -n "$i,";done|sed 's/,$//'))
+                alltags=$(for i in $(git tag -l|grep '^v'|sort -rn);do echo -n "$i,";done|sed 's/,$//')
                 allversions="nightly,stable,$alltags"
                 git config --global user.email "[email protected]"
                 git config --global user.name "Pipelines as Code CI Robot"