Remove deprecated has_rdoc from gemspec #1648

Job	Run time
compiler (ubuntu-20.04)	2m 30s
compiler (ubuntu-22.04)	1m 59s
lib-php (7.1)	1m 5s
lib-php (7.2)	1m 14s
lib-java-kotlin	3m 55s
lib-python (3.x)	1m 30s
lib-php (7.3)	1m 5s
lib-php (7.4)	1m 3s
lib-go (1.21)	1m 41s
lib-php (8)	1m 2s
lib-rust	3m 32s
lib-go (1.22)	1m 48s
lib-swift	1m 16s
lib-php (8.1)	1m 14s
lib-php (8.2)	1m 20s
lib-php (8.3)	1m 13s
cross-test (java, java,kotlin)	1m 28s
cross-test (java, go,rs)	1m 12s
cross-test (java, swift)	43s
cross-test (kotlin, java,kotlin)	21s
cross-test (kotlin, go,rs)	47s
cross-test (kotlin, swift)	21s
cross-test (go, java,kotlin)	47s
cross-test (go, go,rs)	1m 8s
cross-test (go, swift)	23s
cross-test (rs, java,kotlin)	27s
cross-test (rs, go,rs)	34s
cross-test (rs, swift)	51s
cross-test (swift, java,kotlin)	24s
cross-test (swift, go,rs)	1m 26s
cross-test (swift, swift)	28s
	38m 47s

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