rustls-connector: adapt to latest upstream changes #240

Job	Run time
build_library_msrv	2m 7s
build_binary (macos-latest, 1.74.1)	1m 20s
build_binary (macos-latest, stable)	1m 4s
network_tests	18s
style_checks	21s
build_binary (macos-latest, nightly)	4m 18s
build_binary (ubuntu-latest, 1.74.1)	1m 11s
tests	25s
build_binary (ubuntu-latest, stable)	59s
build_binary (ubuntu-latest, nightly)	1m 2s
build_binary (windows-latest, 1.74.1)	2m 25s
build_binary (windows-latest, stable)	8m 25s
build_binary (windows-latest, nightly)	9m 56s
	33m 51s

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