fixes microsoft#138274

Author: joaomoreno

extensions/git/src/test/smoke.test.ts

@@ -42,13 +42,12 @@ suite('git smoke test', function () {
 	suiteSetup(async function () {
 		fs.writeFileSync(file('app.js'), 'hello', 'utf8');
 		fs.writeFileSync(file('index.pug'), 'hello', 'utf8');
-		cp.execSync('git init', { cwd });
+		cp.execSync('git init -b main', { cwd });
 		cp.execSync('git config user.name testuser', { cwd });
 		cp.execSync('git config user.email [email protected]', { cwd });
 		cp.execSync('git config commit.gpgsign false', { cwd });
 		cp.execSync('git add .', { cwd });
 		cp.execSync('git commit -m "initial commit"', { cwd });
-		cp.execSync('git branch -m main', { cwd });
 
 		// make sure git is activated
 		const ext = extensions.getExtension<GitExtension>('vscode.git');