Automated check for new swig releases

[rbSparky]

Added a file swig-update-autocheck.yml in the workflows directory which is scheduled to run every week and runs a bash script that checks for any version updates(from the swig github repo) and checks current version in the .cmake file(using regex), updates the version in swig_version.cmake when needed and issues a PR.

[rbSparky]

I'm sorry I don't clearly understand what is to be done in your idea. Could you explain that again? Also, do I need to make any more changes to this before the merge, or is it fine as it is?

[nightlark]

I'm going to merge this as it is.

The idea is to add the swig version to the PR title, so instead of saying "Update swig version" it could say "Update to swig version 4.0.2".

The gist of it is an echo outputs a line with a special format to set a variable:

- name: Check and update SWIG version
   id: check-swig
   run: echo "::set-output name=new_version::4.0.2"

That variable could then be used in the create PR step by referencing it using the step id that output it:

title: Update swig version ${{ steps.check-swig.outputs.new_version }}

[rbSparky]

Oh I understand now, thanks. I'll implement this and issue a (new?) PR when I'm done.

[nightlark]

Yea, a new PR sounds good. 😄