misc small fixes:

- update actions/cache to v4

- update haskell/actions/setup to haskell-actions/setup

- stack doesn't support ghc < 8.4, remove from CI

- don't fail immediately

- add -fpermissive flag to gcc

- only build 9.6.6 with macos and windows latest

- bump base upper bound

src/runtime/c/configure.ac

@@ -30,6 +30,7 @@ AM_PROG_CC_C_O
  -Wall\
  -Wextra\
  -Wno-missing-field-initializers\
+ -fpermissive\
  -Wno-unused-parameter\
  -Wno-unused-value"
 fi]