Fix macos ghcup and cabal flags (#4)

* fix short-circuit logic for ghcup based installs of ghc

* fix unrecognized user-config option for cabal v2.0

* update dependencies

package.json

@@ -21,30 +21,30 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.2.3",
-    "@actions/exec": "^1.0.3",
+    "@actions/core": "^1.2.4",
+    "@actions/exec": "^1.0.4",
     "@actions/glob": "^0.1.0",
     "@actions/io": "^1.0.2",
-    "@actions/tool-cache": "^1.3.3",
-    "js-yaml": "^3.13.1"
+    "@actions/tool-cache": "^1.5.5",
+    "js-yaml": "^3.14.0"
   },
   "devDependencies": {
-    "@types/jest": "^25.2.1",
-    "@types/js-yaml": "^3.12.3",
-    "@types/node": "^13.13.2",
-    "@typescript-eslint/parser": "^2.29.0",
-    "@typescript-eslint/eslint-plugin": "^2.29.0",
-    "@zeit/ncc": "^0.22.1",
-    "eslint": "^6.8.0",
-    "eslint-plugin-github": "^3.4.1",
-    "eslint-plugin-jest": "^23.8.2",
+    "@types/jest": "^25.2.3",
+    "@types/js-yaml": "^3.12.4",
+    "@types/node": "^14.0.11",
+    "@typescript-eslint/parser": "^3.1.0",
+    "@typescript-eslint/eslint-plugin": "^3.1.0",
+    "@zeit/ncc": "^0.22.3",
+    "eslint": "^7.1.0",
+    "eslint-plugin-github": "^4.0.1",
+    "eslint-plugin-jest": "^23.13.2",
     "husky": "^4.2.5",
-    "jest": "^25.4.0",
-    "jest-circus": "^25.4.0",
-    "lint-staged": "^10.1.7",
+    "jest": "^26.0.1",
+    "jest-circus": "^26.0.1",
+    "lint-staged": "^10.2.9",
     "prettier": "^2.0.5",
-    "ts-jest": "^25.4.0",
-    "typescript": "^3.8.3"
+    "ts-jest": "^26.1.0",
+    "typescript": "^3.9.5"
   },
   "husky": {
     "hooks": {