remove support for GHC < 9

.github/workflows/cabal-ci.yaml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.10', '9.0', '9.2', '9.4', '9.6']
+        ghc: ['9.0', '9.2', '9.4', '9.6', '9.8']
         cabal: ['3.10']
         os: ['ubuntu-22.04', 'ubuntu-20.04', 'macOS-latest']
 

cabal.project

@@ -0,0 +1,30 @@
+packages: merkle-log.cabal
+optimization: 2
+
+-- The following are all dependencies of GHC. 
+--
+allow-newer: *:Cabal
+allow-newer: *:Cabal-syntax
+allow-newer: *:array
+allow-newer: *:base
+allow-newer: *:binary
+allow-newer: *:bytestring
+allow-newer: *:containers
+allow-newer: *:deepseq
+allow-newer: *:directory
+allow-newer: *:exceptions
+allow-newer: *:filepath
+allow-newer: *:ghc
+allow-newer: *:ghc-boot-th
+allow-newer: *:ghc-prim
+allow-newer: *:integer-gmp
+allow-newer: *:mtl
+allow-newer: *:pretty
+allow-newer: *:process
+allow-newer: *:template-haskell
+allow-newer: *:text
+allow-newer: *:time
+allow-newer: *:transformers
+allow-newer: *:unix
+
+constraints: aeson>2

merkle-log.cabal

@@ -12,11 +12,11 @@ maintainer: Lars Kuhtz <[email protected]>
 copyright: Copyright (c) 2019-2023, Kadena LLC
 category: Data
 tested-with:
+    GHC==9.8
     GHC==9.6
     GHC==9.4
     GHC==9.2
     GHC==9.0
-    GHC==8.10
 extra-source-files:
     README.md
     CHANGELOG.md