nix & GHA: dropped GHC < 9.6

Author: hamishmack

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["8.10.7", "9.6", "9.8", "9.10", "9.12"]
+        ghc: ["9.6", "9.8", "9.10", "9.12"]
         os: [windows-latest]
 
     env:

nix/ouroboros-network.nix

@@ -15,10 +15,10 @@ let
   #
   # NOTE: cross compilation with `ghc-9.6.2` doesn't currently work
   # https://ci.iog.io/build/623082/nixlog/2
-  crossGHCVersion = "ghc8107";
+  crossGHCVersion = "ghc966";
 
   # alternative compilers
-  otherCompilers = [ "ghc810" ];
+  otherCompilers = [ "ghc966" ];
 
   # from https://github.com/input-output-hk/haskell.nix/issues/298#issuecomment-767936405
   forAllProjectPackages = cfg: args@{ config, lib, ... }: {