fix(deps): update dependency solc to v0.7.4

package.json

@@ -125,7 +125,7 @@
     "rollup-plugin-terser": "5.3.0",
     "sass": "^1.26.3",
     "sinon": "9.0.1",
-    "solc": "0.6.4",
+    "solc": "0.7.4",
     "solc4": "0.4.25",
     "stream": "0.0.2",
     "style-loader": "^1.1.3",

yarn.lock

@@ -6816,6 +6816,11 @@ follow-redirects@^1.0.0:
   dependencies:
     debug "^3.0.0"
 
+follow-redirects@^1.12.1:
+  version "1.13.0"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.13.0.tgz#b42e8d93a2a7eea5ed88633676d6597bc8e384db"
+  integrity sha512-aq6gF1BEKje4a9i9+5jimNFIpq4Q1WiwBToeRK5NvZBd/TRsmW8BsJfOEGkr76TbOyPVD3OVDN910EcUNtRYEA==
+
 for-in@^0.1.4:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-0.1.8.tgz#d8773908e31256109952b1fdb9b3fa867d2775e1"
@@ -14645,13 +14650,14 @@ [email protected]:
     semver "^5.3.0"
     yargs "^4.7.1"
 
-solc@0.6.4:
-  version "0.6.4"
-  resolved "https://registry.yarnpkg.com/solc/-/solc-0.6.4.tgz#4b0f11fccd6f5ef9802c6bb1c007abb16881c2ca"
-  integrity sha512-HjUCys7ue9n7lGCa1XNf+wDdEY/wY64CpwnD4iPxW+BYYUX6ytwWXKitoolPXOOVxq4jewvwtL7Pngs+5k954A==
+solc@0.7.4:
+  version "0.7.4"
+  resolved "https://registry.yarnpkg.com/solc/-/solc-0.7.4.tgz#9c5ed81ae0692e3e614e47cd5b500b0f9485b98d"
+  integrity sha512-IVLqAfUkJqgTS0JIgFPeC50ehUeBXu2eE+iU+rqb6UeOyf6w/BB/EsNcTSTpjtUti8BTG/sCd2qVhrWVYy7p0g==
   dependencies:
     command-exists "^1.2.8"
     commander "3.0.2"
+    follow-redirects "^1.12.1"
     fs-extra "^0.30.0"
     js-sha3 "0.8.0"
     memorystream "^0.3.1"