Drop support for GHC <8.6

Author: hasufell

.github/workflows/test.yaml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ghc: ['8.0', '8.2', '8.4', '8.6', '8.8', '8.10', '9.0', '9.2', '9.4', '9.6', '9.8']
+        ghc: ['8.6', '8.8', '8.10', '9.0', '9.2', '9.4', '9.6', '9.8']
         cabal: ['3.8.1.0']
         include:
           - os: macOS-latest

os-string.cabal

@@ -16,14 +16,14 @@ category:           System
 build-type:         Simple
 synopsis:           Library for manipulating Operating system strings.
 tested-with:
-  GHC ==8.0.2
-   || ==8.2.2
-   || ==8.4.4
-   || ==8.6.5
+  GHC ==8.6.5
    || ==8.8.4
    || ==8.10.7
    || ==9.0.2
-   || ==9.2.3
+   || ==9.2.8
+   || ==9.4.8
+   || ==9.6.3
+   || ==9.8.1
 
 description:
   This package provides functionality for manipulating @OsString@ values, and is shipped with <https://www.haskell.org/ghc/ GHC>.
@@ -63,7 +63,7 @@ library
 
   default-language: Haskell2010
   build-depends:
-    , base              >=4.9      && <4.20
+    , base              >=4.12.0.0      && <4.20
     , bytestring        >=0.11.3.0
     , deepseq
     , exceptions