Workflows ask for the runner label that exists

One label per runner, spelled <os>-<arch>. The aliases these jobs named
were removed, and a job naming a label no runner carries waits instead of
failing.

Co-authored-by: Hanzo Dev <[email protected]>

.github/workflows/release-matrix.yml

@@ -22,7 +22,7 @@ jobs:
           - id: linux-amd64
             runner: linux-amd64
           - id: linux-arm64
-            runner: luxfi-linux-arm64
+            runner: linux-arm64
           - id: windows-amd64
             runner: luxfi-windows-amd64
     runs-on: ${{ matrix.target.runner }}