Drop support for GHC <= 8.6

Author: hasufell

.github/workflows/test.yaml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ghc: ['8.6', '8.8', '8.10', '9.0', '9.2', '9.4', '9.6', '9.8']
+        ghc: ['8.8', '8.10', '9.0', '9.2', '9.4', '9.6', '9.8']
         include:
           - os: macOS-latest
             ghc: '9.4'

file-io.cabal

@@ -17,8 +17,7 @@ tested-with:    GHC==9.8.1,
                 GHC==9.2.8,
                 GHC==9.0.2,
                 GHC==8.10.7,
-                GHC==8.8.4,
-                GHC==8.6.5
+                GHC==8.8.4
 
 source-repository head
   type:     git
@@ -42,7 +41,7 @@ library
 
   hs-source-dirs: .
   build-depends:
-    , base        >=4.12      && <5
+    , base        >=4.13.0.0 && <5
     , bytestring  >=0.11.3.0
     , deepseq