sdk: Allow to limit the number of concurrent network requests #10111

Job	Run time
Generate Crypto FFI Apple XCFramework	9m 8s
Run Complement Crypto tests / tests	9m 5s
xtask / xtask-🐧	5s
xtask / xtask-🍏	59s
Test UniFFI bindings generation	2m 56s
matrix-rust-components-swift	10m 47s
	33m 0s

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