Permit base-4.21, test ghc-9.12 on CI

flake.nix

@@ -38,7 +38,7 @@
 
         hs-package-name = "with-utf8";
 
-        ghc-versions = [ "8107" "902" "928" "948" "966" "982" "9101" ];
+        ghc-versions = [ "8107" "902" "928" "948" "966" "982" "9101" "9121" ];
 
         # invoke haskell.nix for each ghc version listed in ghc-versions
         pkgs-per-ghc = lib.genAttrs (map (v: "ghc${v}") ghc-versions)

package.yaml

@@ -37,7 +37,7 @@ ghc-options:
   - -Wredundant-constraints
 
 dependencies:
-  - base >= 4.10 && < 4.21
+  - base >= 4.10 && < 4.22
   - text >= 0.7 && < 2.2
 
 library:

with-utf8.cabal

@@ -1,6 +1,6 @@
 cabal-version: 1.18
 
--- This file has been generated from package.yaml by hpack version 0.35.2.
+-- This file has been generated from package.yaml by hpack version 0.37.0.
 --
 -- see: https://github.com/sol/hpack
 
@@ -48,7 +48,7 @@ library
       lib
   ghc-options: -Wall -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
   build-depends:
-      base >=4.10 && <4.21
+      base >=4.10 && <4.22
     , safe-exceptions ==0.1.*
     , text >=0.7 && <2.2
   default-language: Haskell2010
@@ -63,7 +63,7 @@ executable utf8-troubleshoot
   c-sources:
       app/utf8-troubleshoot/cbits/locale.c
   build-depends:
-      base >=4.10 && <4.21
+      base >=4.10 && <4.22
     , directory >=1.2.5.0 && <1.4
     , filepath >=1.0 && <1.6
     , process >=1.0.1.1 && <1.7
@@ -89,7 +89,7 @@ test-suite with-utf8-test
       tasty-discover:tasty-discover
   build-depends:
       HUnit
-    , base >=4.10 && <4.21
+    , base >=4.10 && <4.22
     , deepseq
     , hedgehog
     , safe-exceptions