Fixing the last couple build failures

.config/project/github-ci.nix

@@ -6,7 +6,9 @@ githubSystems: haskellPackages: {
 }: let
   planName = "plan-\${{ matrix.os }}-\${{ matrix.ghc }}\${{ matrix.bounds }}";
   ## NB: Prefer the default compiler version.
-  ghc-version = "9.6.3";
+  ghc-version = "9.6.5";
+  ## This should be the highest GHC version that this workflow built.
+  latest-ghc-version = "9.10.1";
   cabal-version = "3.12.1.0";
   runs-on = "ubuntu-22.04";
 in {
@@ -40,6 +42,12 @@ in {
                   ghc = "8.6.1";
                   os = "macos-13";
                 }
+                ## TODO: For some reason, this combination fails to build
+                ## ghc-paths-0.1.0.12.
+                {
+                  ghc = "9.4.1";
+                  os = "macos-14";
+                }
               ]
               ## GitHub can’t install GHC older than 9.4 on macos-14.
               ++ map (ghc: {
@@ -161,7 +169,8 @@ in {
             id = "setup-haskell-cabal";
             "with" = {inherit cabal-version ghc-version;};
           }
-          {run = "cabal install cabal-plan -flicense-report";}
+          ## The `-Wwarn` offsets an issue where warnings are causing failures.
+          {run = "cabal install cabal-plan -flicense-report --ghc-option=-Wwarn";}
           {
             name = "download Cabal plans";
             uses = "actions/download-artifact@v4";
@@ -174,7 +183,7 @@ in {
           {
             run = ''
               mkdir -p dist-newstyle/cache
-              mv plans/plan-''${{ matrix.os }}-${ghc-version}.json dist-newstyle/cache/plan.json
+              mv plans/plan-${runs-on}-${latest-ghc-version}.json dist-newstyle/cache/plan.json
             '';
           }
           {

flake.nix

@@ -279,6 +279,7 @@
             nixpkgs.lib.versionAtLeast hprev.ghc.version "9.2.0"
             && final.system == "i686-linux"
           then {
+            aeson = final.haskell.lib.dontCheck hprev.aeson;
             enummapset = final.haskell.lib.dontCheck hprev.enummapset;
             ## Tests run out of memory (at least on garnix)
             generic-arbitrary =
@@ -411,9 +412,14 @@
         cabalPackages
         (hpkgs:
           [self.projectConfigurations.${system}.packages.path]
-          ## NB: Haskell Language Server no longer supports GHC <9.2.
+          ## NB: Haskell Language Server no longer supports GHC <9.2, and 9.4
+          ##     has an issue with it on i686-linux.
           ++ nixpkgs.lib.optional
-          (nixpkgs.lib.versionAtLeast hpkgs.ghc.version "9.2")
+          (
+            if system == "i686-linux"
+            then nixpkgs.lib.versionAtLeast hpkgs.ghc.version "9.4"
+            else nixpkgs.lib.versionAtLeast hpkgs.ghc.version "9.2"
+          )
           hpkgs.haskell-language-server);
 
       projectConfigurations =