Set default solidity to 0.8.21

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 = 'soljson-v0.8.18+commit.87f61d96.js'
+var defaultVersion = 'soljson-v0.8.21+commit.d9974bed.js'
 const path = require('path')
 
 compiler.loadRemoteVersion(defaultVersion, (error, solcSnapshot) => {

apps/solidity-compiler/src/app/compiler.ts

@@ -9,7 +9,7 @@ import { CompileTabLogic } from '@remix-ui/solidity-compiler'
 const defaultCompilerParameters = {
   runs: '200',
   optimize: false,
-  version: 'soljson-v0.8.18+commit.87f61d96',
+  version: 'soljson-v0.8.21+commit.d9974bed',
   evmVersion: null, // compiler default
   language: 'Solidity',
   useFileConfiguration: false,

libs/remix-ui/solidity-compiler/src/lib/compiler-container.tsx

@@ -54,7 +54,7 @@ export const CompilerContainer = (props: CompilerContainerProps) => {
     customVersions: [],
     compilerLicense: null,
     selectedVersion: null,
-    defaultVersion: 'soljson-v0.8.18+commit.87f61d96.js', // this default version is defined: in makeMockCompiler (for browser test)
+    defaultVersion: 'soljson-v0.8.21+commit.d9974bed.js', // this default version is defined: in makeMockCompiler (for browser test)
     runs: '',
     compiledFileName: '',
     includeNightlies: false,