Update head.hackage nixpkgs and compiler versions to newer versions

ci/default.nix

@@ -5,17 +5,15 @@ in
 
 with nixpkgs;
 let
-  haskellPackages = nixpkgs.haskellPackages.override { all-cabal-hashes = sources.all-cabal-hashes.outPath; };
+  haskellPackages = nixpkgs.haskell.packages.ghc925.override { all-cabal-hashes = sources.all-cabal-hashes.outPath; };
 
   hackage-repo-tool =
     let src = sources.hackage-security.outPath;
-    in haskellPackages.callCabal2nix "hackage-repo-tool" "${src}/hackage-repo-tool" {
-        optparse-applicative = haskellPackages.callHackage "optparse-applicative" "0.15.1.0" {};
-      };
+    in nixpkgs.haskell.lib.doJailbreak (haskellPackages.callCabal2nix "hackage-repo-tool" "${src}/hackage-repo-tool" {});
 
   overlay-tool =
     let src = sources.overlay-tool;
-    in haskellPackages.callCabal2nix "hackage-overlay-repo-tool" src { };
+    in nixpkgs.haskell.lib.doJailbreak (haskellPackages.callCabal2nix "hackage-overlay-repo-tool" src { });
 
   head-hackage-ci =
     let

ci/head-hackage-ci.cabal

@@ -19,7 +19,7 @@ executable head-hackage-ci
     aeson,
     ansi-wl-pprint,
     async,
-    base >=4.11 && <4.16,
+    base >=4.11 && <5,
     bytestring,
     cabal-plan,
     containers,

ci/nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": null,
         "owner": "commercialhaskell",
         "repo": "all-cabal-hashes",
-        "rev": "3a406043fb5586e6016440b65759b10b036cdb4f",
-        "sha256": "1c2hvz1h14w8s4qxlrrnpsbdi3a712d49w257lgifabh57s94zrb",
+        "rev": "b0a2944a580a29defa7e68ebc6298bf9d851d86a",
+        "sha256": "163m68dcqc0i13s631g18sx5phgabjcvkl0nvkmcgsaqd8fnbzfc",
         "type": "file",
-        "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/3a406043fb5586e6016440b65759b10b036cdb4f.tar.gz",
+        "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/b0a2944a580a29defa7e68ebc6298bf9d851d86a.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "ghc-artefact-nix": {
@@ -53,10 +53,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4418f362e68c69226807a5837fcbfc94f0b92adb",
-        "sha256": "1lh31mnx55c1yh070m0r3xmm39wfzi4mh9fdi8rn31wjzkrzxgrn",
+        "rev": "33e0d99cbedf2acfd7340d2150837fbb28039a64",
+        "sha256": "15ll14rycfarqd7isyfms1fhszw9k36ars58gvdw3bkka5mj48cr",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/4418f362e68c69226807a5837fcbfc94f0b92adb.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/33e0d99cbedf2acfd7340d2150837fbb28039a64.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "overlay-tool": {

default.nix

@@ -9,11 +9,11 @@
 #
 let
   # To update nixpkgs bump rev and baseNixpkgs's sha256.
-  rev = "2f746bc1fcdc24b103bda3a27ed82c23200cc077";
+  rev = "33e0d99cbedf2acfd7340d2150837fbb28039a64";
   baseNixpkgs =
     fetchTarball {
       url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
-      sha256 = "142yl6xakkwmyy8x32h94fci4x09l0yqppq5hwj19a3nmd0zmsjx";
+      sha256 = "042yl6xakkwmyy8x32h94fci4x09l0yqppq5hwj19a3nmd0zmsjx";
     };
 in