Fix for #3851 -- cancel old actions if a commit comes along #3853
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This is a fix for #3851 -- add cancel-in-progress flag to the Github Actions build. This is already done for the main antlr4 repo, where build times can be quite lengthy. This allows a build to be canceled if another commit is pushed right away after discovering a build issue, instead of waiting for the rest of the jobs to complete for the PR.