Remove inactive sponsors #315

Job	Run time
Lint	56s
Test (2.6, gemfiles/activerecord_5.0.2.gemfile)	1m 55s
Test (2.6, gemfiles/activerecord_5.1.0.gemfile)	2m 13s
Test (2.6, gemfiles/activerecord_5.2.2.gemfile)	2m 23s
Test (2.6, gemfiles/activerecord_6.0.0.gemfile)	2m 36s
Test (2.6, gemfiles/activerecord_6.1.0.gemfile)	2m 2s
Test (2.7, gemfiles/activerecord_5.0.2.gemfile)	1m 55s
Test (2.7, gemfiles/activerecord_5.1.0.gemfile)	2m 18s
Test (2.7, gemfiles/activerecord_5.2.2.gemfile)	1m 56s
Test (2.7, gemfiles/activerecord_6.0.0.gemfile)	2m 27s
Test (2.7, gemfiles/activerecord_6.1.0.gemfile)	2m 26s
Test (2.7, gemfiles/activerecord_main.gemfile)	2m 38s
Test (3.0, gemfiles/activerecord_6.0.0.gemfile)	1m 39s
Test (3.0, gemfiles/activerecord_6.1.0.gemfile)	1m 37s
Test (3.0, gemfiles/activerecord_main.gemfile)	2m 53s
Test (jruby, gemfiles/activerecord_5.1.0.gemfile)	1m 38s
Test (jruby, gemfiles/activerecord_5.2.2.gemfile)	2m 18s
Test (jruby, gemfiles/activerecord_6.0.0.gemfile)	3m 28s
Test (truffleruby, gemfiles/activerecord_6.0.0.gemfile)	6m 10s
Test (truffleruby, gemfiles/activerecord_6.1.0.gemfile)	5m 34s
Test (truffleruby, gemfiles/activerecord_main.gemfile)	4m 53s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.1)	2m 8s
Test (gemfiles/activerecord_7.0.0.gemfile, 3.0)	2m 9s
Test (gemfiles/activerecord_6.1.0.gemfile, 3.1)	1m 55s
	1h 2m 7s

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