chore(tooling): require pnpm 7

.scripts/check-for-pnpm.js

@@ -7,7 +7,7 @@ if (!/pnpm/.test(process.env.npm_execpath || '')) {
     `\n⚠️ \u001b[33mThis repository requires using PNPM as the package manager ` +
       ` for scripts to work properly.\u001b[39m` +
       '\n\n1. Install Volta to automatically manage it by running: \x1b[1mcurl https://get.volta.sh | bash\x1b[0m',
-    '\n2. Install PNPM by running: \x1b[1mvolta install pnpm@6\x1b[0m',
+    '\n2. Install PNPM by running: \x1b[1mvolta install pnpm@7\x1b[0m',
     "\n3. Done! Run `pnpm` commands as usual and it'll just work :)",
     '\n\nSee \x1b[1mhttps://volta.sh\x1b[0m for more information.',
     '\n',