fix(deps): update dependency solc to v0.6.6

package.json

@@ -120,7 +120,7 @@
     "rollup-plugin-terser": "5.3.0",
     "sass": "^1.26.3",
     "sinon": "9.0.1",
-    "solc": "0.6.4",
+    "solc": "0.6.6",
     "solc4": "0.4.25",
     "stream": "0.0.2",
     "style-loader": "^1.1.3",

yarn.lock

@@ -14357,10 +14357,10 @@ [email protected]:
     semver "^5.3.0"
     yargs "^4.7.1"
 
-[email protected].4:
-  version "0.6.4"
-  resolved "https://registry.yarnpkg.com/solc/-/solc-0.6.4.tgz#4b0f11fccd6f5ef9802c6bb1c007abb16881c2ca"
-  integrity sha512-HjUCys7ue9n7lGCa1XNf+wDdEY/wY64CpwnD4iPxW+BYYUX6ytwWXKitoolPXOOVxq4jewvwtL7Pngs+5k954A==
+[email protected].6:
+  version "0.6.6"
+  resolved "https://registry.yarnpkg.com/solc/-/solc-0.6.6.tgz#0d4b9c2e7105dd6015583f5e1c5ba6a35861ea71"
+  integrity sha512-p0IO/1fRaHWKN+qR+mUivpwnBpFYD8EoFAzT8VL4lmllNwsyEO7TJJAc2QK0XUeWOYOT92NWKhDNNNLTVbHShA==
   dependencies:
     command-exists "^1.2.8"
     commander "3.0.2"