update requirements.txt

This only applies to outbound NTP requests since we use notrack for our
UDP services and DNS-over-TLS for our local resolver. We'd have no need
for longer timeouts even if that wasn't the case.

requirements.txt

@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.11
+# This file is autogenerated by pip-compile with Python 3.12
 # by the following command:
 #
 #    pip-compile --generate-hashes

sysctl.d/local.conf

@@ -37,6 +37,8 @@ net.mptcp.enabled = 0
 net.netfilter.nf_conntrack_tcp_loose = 0
 net.netfilter.nf_conntrack_tcp_timeout_established = 14400
 net.netfilter.nf_conntrack_tcp_timeout_time_wait = 60
+net.netfilter.nf_conntrack_udp_timeout = 15
+net.netfilter.nf_conntrack_udp_timeout_stream = 15
 net.netfilter.nf_conntrack_expect_max = 1
 
 kernel.yama.ptrace_scope = 2