fix(lock-closed): fix broken policy URL (#77)

Previously, the policy URL used in the automatic conversation locking
comment used a shortened SHA (6 our of 40 chars). Such SHAs only work as
long as there is no other SHA in the repo starting with the same chars.
Since there are now two SHAs starting with the same 6 chars, the link is
broken and resulrts in a 404 error. Example:
angular/angular-cli#18058 (comment)

This commit fixes the broken link by using the full SHA (40 chars).

Author: gkalpak

github-actions/lock-closed/src/main.ts

@@ -32,7 +32,7 @@ async function run(): Promise<void> {
     const days = 30;
     // Standardized Angular Team message for locking issues
     const policyUrl =
-      'https://github.com/angular/angular/blob/67d80f/docs/GITHUB_PROCESS.md#conversation-locking';
+      'https://github.com/angular/angular/blob/8f24bc9443b3872fe095d9f7f77b308a361a13b4/docs/GITHUB_PROCESS.md#conversation-locking';
     const message =
       'This issue has been automatically locked due to inactivity.\n' +
       'Please file a new issue if you are encountering a similar or related problem.\n\n' +