update to lts-20.25, GHC 9.2.8

exercises/stack.yaml

@@ -1,6 +1,2 @@
-resolver: lts-18.18
+resolver: lts-20.25 # GHC 9.2.8
 install-ghc: true
-# workaround for https://github.com/commercialhaskell/lts-haskell/issues/329:
-flags:
-  mintty:
-    win32-2-13-1: false

exercises/tests.cabal

@@ -4,22 +4,22 @@ build-type: Simple
 cabal-version: >= 1.10
 
 library
-  build-depends: QuickCheck==2.14.2
-               , hspec==2.7.10
-               , base==4.14.3.0
+  build-depends: QuickCheck==2.14.3
+               , hspec==2.9.7
+               , base==4.16.4.0
                , containers==0.6.5.1
                , array==0.5.4.0
                , transformers==0.5.6.2
-               , template-haskell==2.16.0.0
-               , th-abstraction==0.4.3.0
-               , generic-random==1.4.0.0
-               , JuicyPixels==3.3.6
-               , HTTP==4000.3.16
+               , template-haskell==2.18.0.0
+               , th-abstraction==0.4.5.0
+               , generic-random==1.5.0.1
+               , JuicyPixels==3.3.7
+               , HTTP==4000.4.1
                , http-types==0.12.3
-               , text==1.2.4.1
-               , bytestring==0.10.12.0
+               , text==1.2.5.0
+               , bytestring==0.11.4.0
                , wai==3.2.3
-               , warp==3.3.18
-               , sqlite-simple==0.4.18.0
+               , warp==3.3.23
+               , sqlite-simple==0.4.18.2
                , parallel==3.2.2.0
   default-language: Haskell2010