core: retry session connection #1998

Job	Run time
cargo fmt	3s
cargo +stable clippy (ubuntu-latest)	2m 18s
cargo +1.74 check (windows-latest)	4m 16s
cargo +stable check (windows-latest)	5m 24s
cargo +1.74 check (ubuntu-latest)	3m 27s
cross +1.74 build armv7-unknown-linux-gnueabihf	1m 3s
cargo +stable check (ubuntu-latest)	4m 23s
cross +stable build armv7-unknown-linux-gnueabihf	55s
cargo +beta check (ubuntu-latest)	3m 26s
cross +1.74 build aarch64-unknown-linux-gnu	1m 12s
cross +stable build aarch64-unknown-linux-gnu	41s
cross +1.74 build riscv64gc-unknown-linux-gnu	1m 6s
cross +stable build riscv64gc-unknown-linux-gnu	46s
	29m 0s

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