Test with newer GHC

Summary:

Test Plan:

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ghc: ['9.8', '9.6', '9.4', '9.2', '9.0', '8.10', '8.8']
+        ghc: ['9.12', '9.10', '9.8', '9.6', '9.4', '9.2', '9.0', '8.10', '8.8']
         include:
         - os: windows-latest
         - os: macOS-latest

CHANGES.txt

@@ -1,5 +1,6 @@
 Changelog for Shake (* = breaking change)
 
+    Test with GHC 9.12
 0.9.8, released 2024, 2024-01-14
     Test with GHC 9.8
     #844, optimise database reading/writing with use unsafeUseAsCString

shake.cabal

@@ -30,7 +30,7 @@ description:
     (e.g. compiler version).
 homepage:           https://shakebuild.com
 bug-reports:        https://github.com/ndmitchell/shake/issues
-tested-with:        GHC==9.8, GHC==9.6, GHC==9.4, GHC==9.2, GHC==9.0, GHC==8.10, GHC==8.8
+tested-with:        GHC==9.12, GHC==9.10, GHC==9.8, GHC==9.6, GHC==9.4, GHC==9.2, GHC==9.0, GHC==8.10, GHC==8.8
 extra-doc-files:
     CHANGES.txt
     README.md