Update ruby-kgio to 2.11.3.
* Update HOMEPAGE.
=== kgio 2.11.3 / 2020-01-08 09:25 UTC
Some doc and warning fixes for newer Rubies.
We're no longer on bogomips.org since it's due
for expiry and I can't pay extortionists for a .org, so
s/bogomips.org/yhbt.net/ for now, and be prepared to move again
when extortionists move onto the .net TLD.
pkg.mk: use --local to "gem install"
pkg.mk: use dark216 theme for Earth Day 2019
test: fix warnings with RUBYOPT=-w
tests: fix unused variable warnings from newer Rubies
test_connect_fd_leak: do not close socket if non-existent
test_syssend: avoid warning on cleanup
build: remove olddoc from the gemspec
doc: remove private email and outdated gmane archives
doc: move from bogomips.org/kgio to yhbt.net/kgio
9104ea7ade