THRIFT-5780 Prevent certain warnings related to net8 #1602

Job	Run time	Billable time
compiler (ubuntu-20.04)	2m 35s	0s
compiler (ubuntu-22.04)	2m 0s	0s
lib-go (1.21)	1m 42s	0s
lib-go (1.22)	1m 43s	0s
lib-java-kotlin	4m 5s	0s
lib-php (7.1)	1m 9s	0s
lib-python (3.x)	1m 57s	0s
lib-php (7.2)	1m 10s	0s
lib-rust	3m 12s	0s
lib-php (7.3)	1m 3s	0s
lib-swift	1m 11s	0s
lib-php (7.4)	1m 11s	0s
lib-php (8)	1m 22s	0s
lib-php (8.1)	1m 32s	0s
lib-php (8.2)	1m 13s	0s
lib-php (8.3)	1m 37s	0s
cross-test (java, java,kotlin)	2m 11s	0s
cross-test (java, go,rs)	1m 35s	0s
cross-test (java, swift)	57s	0s
cross-test (kotlin, java,kotlin)	51s	0s
cross-test (kotlin, go,rs)	40s	0s
cross-test (kotlin, swift)	36s	0s
cross-test (go, java,kotlin)	1m 12s	0s
cross-test (go, go,rs)	1m 24s	0s
cross-test (go, swift)	36s	0s
cross-test (rs, java,kotlin)	39s	0s
cross-test (rs, go,rs)	51s	0s
cross-test (rs, swift)	1m 3s	0s
cross-test (swift, java,kotlin)	1m 0s	0s
cross-test (swift, go,rs)	1m 24s	0s
cross-test (swift, swift)	36s	0s
	44m 17s	0s

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