Add autofix lang-rust (#1441)

.autofix/fixers/update-lang-rust.js

@@ -0,0 +1,21 @@
+const os = require('os');
+
+const register = async (fixers) => {
+  const response = await fetch("https://api.github.com/repos/rust-lang/rust/releases/latest");
+  const data = await response.json();
+  const version = data.tag_name;
+
+  const patchVersionReplacements = {
+    '1\\.[0-9][0-9]*\\.[0-9][0-9]*': version,
+  }
+
+  fixers[0].push({
+    id: 'update-lang-rust',
+    cmd: Object.keys(patchVersionReplacements).map(pattern => {
+      return `sed ${os.type() === 'Darwin' ? '-i "" -E' : '-i -e'} "s/\\(RUST_VERSION.*\\)${pattern}/\\1${patchVersionReplacements[pattern]}/g" chunks/lang-rust/chunk.yaml`;
+    }).join('\n'),
+    description: 'update lang rust',
+  });
+};
+
+exports.register = register