systemd/sddm: set proper pkgver and _pkgrel
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Include 0.21.0 in the pkgver instead of _git20240428, as we use the 0.21.0 git tarball as source just like the Alpine package.
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Set _pkgrel=5 to indicate what Alpine pkgrel this fork is based on. This makes it easier to compare the packages / patches that we might need to apply downstream. Furthermore with _pkgrel set and pmbootstrap!2649 (merged) merged, we will get notified when the pkgrel of the Alpine package and _pkgrel of this package get out-of-sync.