update default Solidity version to 0.7.4

apps/remix-ide/ci/makeMockCompiler.js

@@ -3,7 +3,7 @@
 var fs = require('fs')
 var compiler = require('solc')
 var compilerInput = require('@remix-project/remix-solidity').CompilerInput
-var defaultVersion = 'v0.6.6+commit.6c089d02'
+var defaultVersion = 'v0.7.4+commit.3f05b770'
 const path = require('path')
 
 compiler.loadRemoteVersion(defaultVersion, (error, solcSnapshot) => {

apps/remix-ide/src/app/tabs/compileTab/compilerContainer.js

@@ -23,7 +23,7 @@ class CompilerContainer {
       timeout: 300,
       allversions: null,
       selectedVersion: null,
-      defaultVersion: 'soljson-v0.6.6+commit.6c089d02.js' // this default version is defined: in makeMockCompiler (for browser test) and in package.json (downloadsolc_root) for the builtin compiler
+      defaultVersion: 'soljson-v0.7.4+commit.3f05b770.js' // this default version is defined: in makeMockCompiler (for browser test) and in package.json (downloadsolc_root) for the builtin compiler
     }
   }
 

package.json

@@ -50,7 +50,7 @@
     "bumpVersion:libs": "gulp; gulp syncLibVersions;",
     "browsertest": "sleep 5 && npm run nightwatch_local",
     "csslint": "csslint --ignore=order-alphabetical --errors='errors,duplicate-properties,empty-rules' --exclude-list='apps/remix-ide/assets/css/font-awesome.min.css' apps/remix-ide/assets/css/",
-    "downloadsolc_root": "wget --no-check-certificate https://solc-bin.ethereum.org/bin/soljson-v0.6.6+commit.6c089d02.js -O ./apps/remix-ide/soljson.js",
+    "downloadsolc_root": "wget --no-check-certificate https://solc-bin.ethereum.org/bin/soljson-v0.7.4+commit.3f05b770.js -O ./apps/remix-ide/soljson.js",
     "make-mock-compiler": "node apps/remix-ide/ci/makeMockCompiler.js",
     "minify": "uglifyjs --in-source-map inline --source-map-inline -c warnings=false",
     "nightwatch_parallel": "nx build remix-ide-e2e; nx e2e remix-ide-e2e -env=chrome,firefox",