pmb: Use unpacking operator to concatenate collections (MR 2525)

See https://docs.astral.sh/ruff/rules/collection-literal-concatenation

This is also slightly faster according to a microbenchmark that
shows it taking around 19% less time to run:
https://github.com/astral-sh/ruff/pull/1957#issue-1538092351

pmb/helpers/lint.py

@@ -96,7 +96,7 @@ def check(pkgnames: Sequence[str]) -> None:
     has_failed = False
     for pkgrepo, apkbuild_paths in apkbuilds.items():
         if pmb.chroot.user(
-            ["apkbuild-lint"] + apkbuild_paths,
+            ["apkbuild-lint", *apkbuild_paths],
             check=False,
             output="stdout",
             working_dir=dest_paths[pkgrepo_name(repo)],