Don't use pull_request.head for she

Decided to remove this line because the head she may or may not always be the current sha. 

I think we should still merge this PR since it updates packages that are causing deprecation warnings.

src/main.ts

@@ -34,7 +34,7 @@ async function run(): Promise<void> {
       repo: context.repo.repo ?? '',
       owner: context.repo.owner ?? '',
       issue_number: context.payload.number ?? 0,
-      sha: context.payload.after || context.payload.pull_request?.head.sha || "",
+      sha: context.payload.after || '',
     })
 
     if(github.CONFIG.sha === '')