Fix macOS test on GHA

GHA arm64 macs do not have x86_64 Homebrew, so let's just
use the default now.

tests/test-macos.sh

@@ -207,8 +207,7 @@ teardown() {
     echo "$output"
     [[ "$status" -eq 0 ]]
 
-    # This is different on arm hardware
-    run rig sysreqs add -a x86_64 checkbashisms tidy-html5 pkgconfig
+    run rig sysreqs add checkbashisms tidy-html5 pkgconfig
     echo "$output"
     [[ "$status" -eq 0 ]]
 }