's' in package names is replaced with comma on MacOS

[andy-maier]

The regular expression used in the action.yml file:

      PKGS=$( \
        echo '${{ steps.bindep.outputs.packages }}' \
        | \
        sed 's#\(^\s\+\|\s\+$\)##g;s#\s#\,#g' \
      )

does not work with the "sed" command in MacOS.

For example, it replaces "s" with comma:

$ echo 'libxslt' | sed 's#\(^\s\+\|\s\+$\)##g;s#\s#\,#g'
libx,lt

Log file: https://github.com/pywbem/pywbem/actions/runs/9377087850/job/25818072248#step:11:108

It also does not strip blanks:

$ echo ' libxml2' | sed 's#\(^\s\+\|\s\+$\)##g;s#\s#\,#g'
 libxml2

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