chore: keep the launchers off the release

check_release reports a launcher in the checksum list as unrecorded and
one attached as extra, as it does for install.py. The release steps no
longer run build_port, and the checksum and upload globs name the packs
(*_BIOS_Pack*.zip) so a launcher left in dist/ is never caught.

tests/test_split_pack.py

@@ -278,7 +278,7 @@ class ReleaseProcessPublishesArchives(unittest.TestCase):
     def test_the_checksums_are_those_of_the_published_files(self):
         self.assertLess(
             self.text.index("scripts/split_pack.py"),
-            self.text.index("sha256sum *.zip"),
+            self.text.index("sha256sum *_BIOS_Pack*.zip"),
         )