CI: validate.yml: add ghc 9.14-alpha2

- Update ghc-latest.config: 9.12 -> 9.14
- ghc-latest.config: allow-newer:
  - binary
  - containers
  - ghc-bignum

Author: ulysses4ever

.github/workflows/validate.yml

@@ -60,6 +60,7 @@ jobs:
             # IMPORTANT: If you remove a version from this list, then add it to the old-ghcs job below.
             # Also a removed GHC from here means that we are actually dropping
             # support, so the PR *must* have a changelog entry.
+            "9.14.0.20250908",
             "9.12.2",
             "9.10.2",
             "9.8.4",
@@ -130,7 +131,7 @@ jobs:
         with:
           ghc-version: ${{ matrix.ghc }}
           cabal-version: 3.12.1.0 # see https://github.com/haskell/cabal/pull/10251
-          ghcup-release-channel: https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.8.yaml
+          ghcup-release-channel: https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.9.yaml
 
       #  See the following link for a breakdown of the following step
       #  https://github.com/haskell/actions/issues/7#issuecomment-745697160

project-cabal/ghc-latest.config

@@ -8,11 +8,11 @@
 
 -- NOTE: don't forget to update the compiler version in the conditional
 -- when upgrading to a newer GHC
-if impl(ghc >= 9.12.0)
+if impl(ghc >= 9.14.0)
     allow-newer:
     --windns:*, rere:*, tree-diff:*, uuid-types:*, these:*, assoc:*, semialign:*, indexed-traversable-instances:*, indexed-traversable:*, OneTuple:*, scientific:*, time-compat:*, text-short:*, integer-conversion:*, generically:*, data-fix:*, binary:*
     -- Artem, 2024-04-21: I started and then gave up...
-        *:base, *:template-haskell, text-short, *:deepseq, *:bytestring, *:ghc-prim
+        *:base, *:template-haskell, text-short, *:deepseq, *:bytestring, *:ghc-prim, *:ghc-bignum, *:containers
 
 --    repository head.hackage.ghc.haskell.org
 --        url: https://ghc.gitlab.haskell.org/head.hackage/