Bump actions/checkout from 3 to 4 (#23)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
   ormolu:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell-actions/run-ormolu@v14
   ci:
     name: Run tests
@@ -27,7 +27,7 @@ jobs:
           - 9.2.7
           - 9.4.5
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell/actions/setup@v2
         id: setup-haskell
         with:

.github/workflows/publish.yml

@@ -7,7 +7,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell/actions/setup@v2
         with:
           ghc-version: '8.10.7'

cabal.project

@@ -1,3 +1,7 @@
 packages: .
 
 constraints: dhall -with-http
+
+-- TODO remove?
+if impl(ghc ==8.6.*)
+  constraints: aeson >=1.5