deps: bump up nghttp2 to v1.65.0 (envoyproxy#39410)

## Description

This PR bumps up the version of `nghttp2` to v1.65.0. This version
completely removes RFC 7540 Priorities implementation and hence we are
removing the `PriorityFlood` test.

**Release Notes:** https://nghttp2.org/blog/2025/03/02/nghttp2-v1-65-0/

---

**Commit Message:** deps: bump up `nghttp2` to v1.65.0
**Additional Description:** Bump up the version of `nghttp2` to v1.65.0
**Risk Level:** Low
**Testing:** CI
**Docs Changes:** N/A
**Release Notes:** N/A

Signed-off-by: Rohit Agrawal <[email protected]>

Author: agrawroh

bazel/repository_locations.bzl

@@ -535,12 +535,12 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_name = "Nghttp2",
         project_desc = "Implementation of HTTP/2 and its header compression algorithm HPACK in C",
         project_url = "https://nghttp2.org",
-        version = "1.64.0",
-        sha256 = "20e73f3cf9db3f05988996ac8b3a99ed529f4565ca91a49eb0550498e10621e8",
+        version = "1.65.0",
+        sha256 = "8ca4f2a77ba7aac20aca3e3517a2c96cfcf7c6b064ab7d4a0809e7e4e9eb9914",
         strip_prefix = "nghttp2-{version}",
         urls = ["https://github.com/nghttp2/nghttp2/releases/download/v{version}/nghttp2-{version}.tar.gz"],
         use_category = ["controlplane", "dataplane_core"],
-        release_date = "2024-10-21",
+        release_date = "2025-03-02",
         cpe = "cpe:2.3:a:nghttp2:nghttp2:*",
         license = "MIT",
         license_url = "https://github.com/nghttp2/nghttp2/blob/v{version}/LICENSE",

test/common/http/http2/codec_impl_test.cc

@@ -3450,16 +3450,6 @@ TEST_P(Http2CodecImplTest, MetadataFlood) {
   EXPECT_EQ(1, server_stats_store_.counter("http2.outbound_flood").value());
 }
 
-TEST_P(Http2CodecImplTest, PriorityFlood) {
-  expect_buffered_data_on_teardown_ = true;
-  priorityFlood();
-  driveToCompletion();
-  // The PRIORITY flood is detected by the server codec.
-  EXPECT_FALSE(server_wrapper_->status_.ok());
-  EXPECT_TRUE(isBufferFloodError(server_wrapper_->status_));
-  EXPECT_EQ(server_wrapper_->status_.message(), "Too many PRIORITY frames");
-}
-
 TEST_P(Http2CodecImplTest, PriorityFloodOverride) {
   max_inbound_priority_frames_per_stream_ = 2147483647;