refactor: bump ganache-cli to latest stable version for compat with newer solc

Fixes #1461

packages/embark-blockchain-connector/package.json

@@ -54,7 +54,7 @@
     "embarkjs": "^4.1.0-beta.0",
     "ethereumjs-tx": "1.3.7",
     "ethereumjs-util": "6.0.0",
-    "ganache-cli": "6.2.3",
+    "ganache-cli": "6.4.3",
     "web3": "1.0.0-beta.37"
   },
   "devDependencies": {

packages/embark/package.json

@@ -134,7 +134,7 @@
     "flatted": "0.2.3",
     "follow-redirects": "1.5.7",
     "fs-extra": "7.0.1",
-    "ganache-cli": "6.2.3",
+    "ganache-cli": "6.4.3",
     "glob": "7.1.3",
     "globule": "1.2.1",
     "handlebars": "4.0.13",