cd: deploy source packages with the right version

For now, source packages are deployed to our repositories with the wrong
version. It is due to the actions/checkout bug with not preserving tag
annotations [1].

This issue was fixed from our side by adding a workaround [2] to the
.github/actions/environment action. But for some reason, invocation of
this action was not added to the 'source.yml' workflow. This patch fixes
that.

[1] https://github.com/actions/checkout/issues/290
[2] https://github.com/tarantool/tarantool/pull/6197

Closes tarantool/tarantool-qa#146