Here's an update of tornado to 6.4. This includes a fix for CVE-2023-28370 
which affects versions earlier than 6.3.2.

Version 6.4 also brings Python 3.12 support.

Tested that these reverse consumers still build and lightly runtested them 
too:

devel/py-ipykernel
devel/py-jupyter_client
security/boofuzz
www/apertium-apy
www/jupyter-notebook
www/py-bokeh
www/py-terminado

(security/boofuzz needed a few tweaks and new ports to run the regress 
tests though).

ok?

Index: Makefile
===================================================================
RCS file: /cvs/ports/www/py-tornado/Makefile,v
diff -u -p -u -r1.31 Makefile
--- Makefile	25 Nov 2022 21:11:41 -0000	1.31
+++ Makefile	17 Jan 2024 17:25:33 -0000
@@ -1,9 +1,8 @@
 COMMENT =		scalable, non-blocking web server
 
-MODPY_EGG_VERSION =	6.2
+MODPY_EGG_VERSION =	6.4
 DISTNAME =		tornado-${MODPY_EGG_VERSION}
 PKGNAME =		py-${DISTNAME}
-REVISION =		1
 
 CATEGORIES =		www
 
@@ -21,13 +20,9 @@ FLAVOR  =		python3
 
 MODPY_PI =		Yes
 MODPY_PYBUILD =		setuptools
-MODPY_PYTEST_ARGS =	tornado/test
 
 TEST_DEPENDS =		devel/py-twisted${MODPY_FLAVOR} \
 			net/py-cares${MODPY_FLAVOR} \
 			net/py-curl${MODPY_FLAVOR}
-
-pre-test:
-	${MODPY_CMD} build_ext --inplace
 
 .include <bsd.port.mk>
Index: distinfo
===================================================================
RCS file: /cvs/ports/www/py-tornado/distinfo,v
diff -u -p -u -r1.14 distinfo
--- distinfo	4 Jul 2022 11:52:42 -0000	1.14
+++ distinfo	17 Jan 2024 17:25:33 -0000
@@ -1,2 +1,2 @@
-SHA256 (tornado-6.2.tar.gz) = m2MEGb3oTsZmv9fqCkyyqKZRwtXMzb3RlyoMhZ38PBM=
-SIZE (tornado-6.2.tar.gz) = 504849
+SHA256 (tornado-6.4.tar.gz) = cikfpua8hOYmWJ8cKdkKWm1ZPvWuaAUu4u8ADf0nPe4=
+SIZE (tornado-6.4.tar.gz) = 498845
Index: pkg/PLIST
===================================================================
RCS file: /cvs/ports/www/py-tornado/pkg/PLIST,v
diff -u -p -u -r1.15 PLIST
--- pkg/PLIST	25 Nov 2022 21:11:41 -0000	1.15
+++ pkg/PLIST	17 Jan 2024 17:25:33 -0000
@@ -126,6 +126,8 @@ lib/python${MODPY_VERSION}/site-packages
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}auth_test.${MODPY_PYC_MAGIC_TAG}pyc
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}autoreload_test.${MODPY_PYC_MAGIC_TAG}${MODPY_PYOEXTENSION}
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}autoreload_test.${MODPY_PYC_MAGIC_TAG}pyc
+lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}circlerefs_test.${MODPY_PYC_MAGIC_TAG}${MODPY_PYOEXTENSION}
+lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}circlerefs_test.${MODPY_PYC_MAGIC_TAG}pyc
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}concurrent_test.${MODPY_PYC_MAGIC_TAG}${MODPY_PYOEXTENSION}
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}concurrent_test.${MODPY_PYC_MAGIC_TAG}pyc
 lib/python${MODPY_VERSION}/site-packages/tornado/test/${MODPY_PYCACHE}curl_httpclient_test.${MODPY_PYC_MAGIC_TAG}${MODPY_PYOEXTENSION}
@@ -193,6 +195,7 @@ lib/python${MODPY_VERSION}/site-packages
 lib/python${MODPY_VERSION}/site-packages/tornado/test/asyncio_test.py
 lib/python${MODPY_VERSION}/site-packages/tornado/test/auth_test.py
 lib/python${MODPY_VERSION}/site-packages/tornado/test/autoreload_test.py
+lib/python${MODPY_VERSION}/site-packages/tornado/test/circlerefs_test.py
 lib/python${MODPY_VERSION}/site-packages/tornado/test/concurrent_test.py
 lib/python${MODPY_VERSION}/site-packages/tornado/test/csv_translations/
 lib/python${MODPY_VERSION}/site-packages/tornado/test/csv_translations/fr_FR.csv