Update package set and PureScript version in CI to 0.14 (#14)

Author: peterbecich

.github/workflows/ci.yml

@@ -11,8 +11,6 @@ jobs:
 
       - name: Set up PureScript toolchain
         uses: purescript-contrib/setup-purescript@main
-        with:
-          purescript: "0.14.0-rc5"
 
       - name: Cache PureScript dependencies
         uses: actions/cache@v2

packages.dhall

@@ -1,4 +1,4 @@
 let upstream =
-      https://raw.githubusercontent.com/purescript/package-sets/prepare-0.14/src/packages.dhall
+      https://github.com/purescript/package-sets/releases/download/psc-0.14.0/packages.dhall sha256:710b53c085a18aa1263474659daa0ae15b7a4f453158c4f60ab448a6b3ed494e
 
 in  upstream