Add base64 to gemspec (#218) #503

Job	Run time
test-opensearch (2.5)	2m 2s
test-opensearch (2.6)	2m 7s
test-opensearch (2.7)	2m 7s
test-opensearch (3.0)	1m 53s
test-opensearch (3.1)	2m 1s
test-opensearch (3.2)	1m 59s
test-opensearch (jruby-9.3)	2m 57s
test-opensearch-faraday-1 (2.6)	1m 55s
test-opensearch-faraday-1 (2.7)	1m 56s
test-opensearch-faraday-1 (3.0)	1m 56s
test-opensearch-faraday-1 (3.1)	1m 45s
test-opensearch-faraday-1 (3.2)	1m 48s
test-opensearch-faraday-1 (jruby-9.3)	2m 2s
test-opensearch-security (2.5)	1m 50s
test-opensearch-security (2.6)	2m 1s
test-opensearch-security (2.7)	2m 3s
test-opensearch-security (3.0)	1m 50s
test-opensearch-security (3.1)	1m 48s
test-opensearch-security (3.2)	1m 46s
test-opensearch-security (jruby-9.3)	1m 35s
	39m 21s

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