ci/check_changed_aports_ver: fix pkgrel check (MR 5061)

The apkbuild parser returns `pkgrel` key as a `str`, not an `int`,
so the `!= 0` check would always succeed even if the file set it to `0`.

[ci:skip-build]: already built successfully in CI

.ci/lib/check_changed_aports_versions.py

@@ -140,7 +140,7 @@ def check_versions(args, packages):
             # checksums changed
             else:
                 # Check that pkgrel was reset to 0
-                if head_parsed["pkgrel"] != 0:
+                if head_parsed["pkgrel"] != "0":
                     print(f" - {package}: pkgrel should be 0 when package source checksums change."
                           "See: https://wiki.postmarketos.org/wiki/Packaging#device_packages_and_other_packages_without_sources")
                     error = True