ci: try to speed up the openbsd timeout tests

The default is 150s which is a long time to wait, and I need faster
feedback loops.

.github/workflows/ci.yml

@@ -156,6 +156,10 @@ jobs:
           ln -sf /usr/local/bin/ri31 /usr/local/bin/ri
           ln -sf /usr/local/bin/syntax_suggest31 /usr/local/bin/syntax_suggest
           ln -sf /usr/local/bin/typeprof31 /usr/local/bin/typeprof
+          sysctl -a net.inet.tcp
+          sysctl net.inet.tcp.keepinittime=15
+          sysctl net.inet.tcp.keepintvl=15
+          sysctl -a net.inet.tcp
         run: |
           git config --global --add safe.directory /home/runner/work/mini_portile/mini_portile
           gem install bundler