chore: Exclude sample directory from gemspec files #1344

Job	Run time
check-misc (head)	14s
check-misc (head)	14s
steep-check (head)	25s
steep-check (head)	25s
test-memory (head)	21s
test-memory (head)	32s
test-ruby (head, master)	5m 43s
test-ruby (head, master)	5m 43s
test-windows (head)	1m 40s
test-windows (head)	1m 40s
test-ruby (3.0, master)	5m 37s
test-ruby (3.0, master)	5m 37s
ruby-versions / Generate Ruby versions	5s
ruby-versions / Generate Ruby versions	5s
test (2.5)	23s
test (2.5)	23s
test (2.6)	39s
test (2.6)	39s
test (2.7)	23s
test (2.7)	23s
test (3.0)	15s
test (3.0)	15s
test (3.1)	13s
test (3.1)	13s
test (3.2)	28s
test (3.2)	28s
test (3.3)	9s
test (3.3)	9s
test (head)	12s
test (head)	12s
	33m 45s

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