Raise dependabot open-pull-requests-limit to 10 #292

Job	Run time
build (gemfiles/Gemfile.activerecord-6.0, 2.5)	1m 56s
build (gemfiles/Gemfile.activerecord-6.1, 2.5)	1m 53s
build (gemfiles/Gemfile.activerecord-5.2, 2.4)	1m 57s
build (gemfiles/Gemfile.activerecord-5.0, 2.4)	1m 51s
build (gemfiles/Gemfile.activerecord-8.1, 3.3)	2m 0s
build (gemfiles/Gemfile.activerecord-8.0, 3.2)	2m 4s
build (gemfiles/Gemfile.activerecord-7.0, 2.7)	2m 21s
build (gemfiles/Gemfile.activerecord-5.1, 2.4)	1m 46s
build (gemfiles/Gemfile.activerecord-7.2, 3.1)	1m 37s
build (gemfiles/Gemfile.activerecord-7.1, 2.7)	2m 4s
	19m 29s

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