build-unit-test-docker: nghttp2: update to 1.57.0

The 1.57.0 release is now used in upstream poky.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifb2d5ddbb86249ce752ff6be545cec700e115ffe
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index 1798989..2312c26 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -139,7 +139,7 @@
         config_flags=["-DTHREADS_PREFER_PTHREAD_FLAG=ON"],
     ),
     "nghttp2/nghttp2": PackageDef(
-        rev="v1.54.0",
+        rev="v1.57.0",
         build_type="cmake",
         config_env=["CXXFLAGS=-std=c++20"],
         config_flags=[