Tests

Add support for multiple files in files_upload_v2 method #1744

Job	Run time
test (ruby=ruby-head)	27s
test (ruby=3.3)	28s
test (ruby=3.4)	26s
test (ruby=3.2)	32s
test (ruby=2.7, concurrency=async-websocket)	27s
test (ruby=jruby-head)	26s
test (ruby=3.1)	25s
test (ruby=3.0)	23s
test (ruby=2.7)	33s
coveralls	0s
	4m 7s

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