.github/workflows/dist.yml: Fix TARGETS_PRE

Author: mkoeppe

.github/workflows/dist.yml

@@ -56,7 +56,7 @@ jobs:
       # SPKGs to install as system packages
       SPKGS: _bootstrap _prereq
       # Non-Python packages to install as spkgs
-      TARGETS_PRE: pplpy-build-deps
+      TARGETS_PRE: ppl gmp mpfr mpc
       # Disable building PyPy wheels on all platforms
       # Disable musllinux until #33083 provides alpine package information
       CIBW_SKIP: "pp* *-musllinux*"