fix(git): prevent users from passing additional flags to ls-remote (#2661)

before:
error: unknown option `test'

after:
fatal: strange pathname '--test' blocked

Author: rli

src/shared/extensions/git.ts

@@ -252,7 +252,7 @@ export class GitExtension {
         // TODO: make a promise 'pipe' function
         if (branches.length === 0) {
             try {
-                const { stdout } = await execFileAsync(api.git.path, ['ls-remote', '--heads', remote.fetchUrl ?? ''])
+                const { stdout } = await execFileAsync(api.git.path, ['ls-remote', '--heads', '--', remote.fetchUrl ?? ''])
                 return stdout
                     .toString()
                     .split(/\r?\n/)