Fix for T219433414 ("Your diff, D69161451, broke some tests")

Summary:
This diff was created by the [Devmate](https://fb.workplace.com/groups/1205375940786433/permalink/1205378807452813/) to automatically fix the broken tests assigned to you / your team in T219433414:
- The agent searched for and edited the files it deemed relevant for fixing the tests
- After generating the patch, the broken test(s) were rerun to verify they now pass
- CI tests must pass in Phabricator before this diff is published; otherwise, it is in draft state and should not be reviewed

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**If this diff is the correct fix for T219433414, please accept and land the diff**. *Note that while we set a high quality bar for the agent publishing these diffs, LLM-powered agents still make mistakes, so your critical review is much appreciated and will help us improve!*

**If changes need to be made:** Please commandeer the diff, or comment with the specific changes needed.

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Reviewed By: afrind

Differential Revision: D72030656

fbshipit-source-id: ee3b6d8d5410f3dd1c7e251bf6754b61685f3f8a

Author: generatedunixname537391475639613

proxygen/lib/http/codec/HTTP2Framer.cpp

@@ -460,6 +460,9 @@ ErrorCode parseRFC9218Priority(Cursor& cursor,
   if (header.stream != 0) {
     return ErrorCode::PROTOCOL_ERROR;
   }
+  if (header.length <= sizeof(priStream)) {
+    return ErrorCode::FRAME_SIZE_ERROR;
+  }
   priStream = parseUint31(cursor);
   auto priLen = header.length - sizeof(priStream);
   outPriority.resize(priLen);