podman-compose: switch to main branch

The upstream project has made the "interesting" decision to
delete the stable branch and move to "main" for recent
releases. So rather than being able to simply switch for our
updates, we have to switch to main on all releases that had
podman-compose recipes using the stable branch.

Luckily, the commit hashes haven't changed, so we only have
to modify the branch in the SRC_URI.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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