Ruby

Bump pstore from 0.1.4 to 0.2.0 #6280

Job	Run time
test (3.1, test)	2m 13s
valgrind	44m 30s
test (3.2, test)	2m 4s
test (3.3, test)	2m 26s
test (3.4, test)	2m 31s
test (head, test)	3m 5s
test (head, stdlib_test rubocop)	2m 42s
test (3.4, stdlib_test)	1m 42s
test (3.4, test, --enable-frozen-string-literal)	2m 18s
test (3.4, stdlib_test, --enable-frozen-string-literal)	1m 51s
test (3.4, lexer templates compile confirm_lexer confirm_templates)	2m 52s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 4s
test (3.4, typecheck_test)	56s
	1h 11m 14s

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