[DRE-maint] Bug#1007000: thin FTBFS on IPV6-only buildds

[Adrian Bunk]

Source: thin
Version: 1.8.0-1
Severity: serious
Tags: ftbfs

https://buildd.debian.org/status/fetch.php?pkg=thin&arch=amd64&ver=1.8.0-1%2Bb2&stamp=1646907946&raw=0

...
Thin::Server robustness
#<Thread:0x0000558de6ee4318 /<<PKGBUILDDIR>>/spec/spec_helper.rb:191 run> terminated with exception (report_on_exception is true):
/usr/lib/ruby/vendor_ruby/eventmachine.rb:532:in `start_tcp_server': no acceptor (port is in use or requires root privileges) (RuntimeError)
	from /usr/lib/ruby/vendor_ruby/eventmachine.rb:532:in `start_server'
	from /<<PKGBUILDDIR>>/lib/thin/backends/tcp_server.rb:16:in `connect'
	from /<<PKGBUILDDIR>>/lib/thin/backends/base.rb:65:in `block in start'
	from /usr/lib/ruby/vendor_ruby/eventmachine.rb:196:in `run_machine'
	from /usr/lib/ruby/vendor_ruby/eventmachine.rb:196:in `run'
	from /<<PKGBUILDDIR>>/lib/thin/backends/base.rb:75:in `start'
	from /<<PKGBUILDDIR>>/lib/thin/server.rb:162:in `start'
	from /<<PKGBUILDDIR>>/spec/spec_helper.rb:191:in `block in start_server'
E: Build killed with signal TERM after 150 minutes of inactivity