cabal: Drop support for GHC 8.6.5

See xmonad#921

Author: slotThe

.github/workflows/haskell-ci.yml

@@ -8,9 +8,9 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.19.20241114
+# version: 0.19.20250115
 #
-# REGENDATA ("0.19.20241114",["github","cabal.project"])
+# REGENDATA ("0.19.20250115",["github","cabal.project"])
 #
 name: Haskell-CI
 on:
@@ -76,11 +76,6 @@ jobs:
             compilerVersion: 8.8.4
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-8.6.5
-            compilerKind: ghc
-            compilerVersion: 8.6.5
-            setup-method: ghcup
-            allow-failure: false
       fail-fast: false
     steps:
       - name: apt-get install

xmonad-contrib.cabal

@@ -38,7 +38,7 @@ cabal-version:      1.12
 build-type:         Simple
 bug-reports:        https://github.com/xmonad/xmonad-contrib/issues
 
-tested-with:        GHC == 8.6.5 || == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.8 || == 9.4.8 || == 9.6.6 || == 9.8.2 || == 9.10.1
+tested-with:        GHC == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.8 || == 9.4.8 || == 9.6.6 || == 9.8.2 || == 9.10.1
 
 source-repository head
   type:     git
@@ -80,7 +80,7 @@ library
        ghc-options: -Werror -Wwarn=deprecations
 
     -- Keep this in sync with the oldest version in 'tested-with'
-    if impl(ghc > 8.6.5)
+    if impl(ghc > 8.8.4)
        -- don't treat unused-imports warning as errors, they may be necessary
        -- for compatibility with older versions of base (or other deps)
        ghc-options: -Wwarn=unused-imports
@@ -507,7 +507,7 @@ test-suite tests
      ghc-options: -Werror -Wwarn=deprecations
 
   -- Keep this in sync with the oldest version in 'tested-with'
-  if impl(ghc > 8.6.5)
+  if impl(ghc > 8.8.4)
      -- don't treat unused-imports warning as errors, they may be necessary
      -- for compatibility with older versions of base (or other deps)
      ghc-options: -Wwarn=unused-imports