Using --no-patch instead of --quiet

Because --quiet would make the git diff
exits with 1 when it has differences, still
its not expected. Exit code none other than 0
is considered error.

src/utils.ts

@@ -908,7 +908,7 @@ export const canDiffCommits = async ({
   } else {
     const {exitCode, stderr} = await exec.getExecOutput(
       'git',
-      ['diff', '--quiet', sha1, sha2],
+      ['diff', '--no-patch', sha1, sha2],
       {
         cwd,
         ignoreReturnCode: true,