chore: bump tnt-core to 0.3.0 (#675) #1065

Job	Run time
cargo clippy	8m 37s
Rustfmt	20s
cargo test (gadget-networking)	2m 32s
cargo test (incredible-squaring-blueprint)	8m 25s
cargo test (gadget-executor)	1m 0s
cargo test (incredible-squaring-blueprint-eigenlayer)	6m 16s
cargo test (gadget-utils-tangle)	5m 59s
cargo test (blueprint-examples)	11m 55s
cargo test (gadget-tangle-testing-utils)	6m 14s
cargo test (gadget-blueprint-proc-macro)	17m 41s
cargo test (gadget-blueprint-proc-macro-core)	5m 0s
cargo test (gadget-context-derive)	19m 30s
cargo test (gadget-client-eigenlayer)	4m 0s
cargo test (gadget-client-evm)	3m 29s
cargo test (gadget-client-tangle)	5m 37s
cargo test (gadget-crypto-sp-core)	1m 43s
cargo test (gadget-crypto-ed25519)	1m 5s
cargo test (gadget-crypto-bls)	1m 11s
cargo test (gadget-crypto-k256)	1m 16s
cargo test (gadget-crypto-sr25519)	1m 2s
cargo test (gadget-event-listeners-core)	1m 17s
cargo test (gadget-event-listeners-cronjob)	1m 9s
cargo test (gadget-blueprint-serde)	1m 43s
cargo test (gadget-config)	3m 6s
cargo test (gadget-keystore)	3m 52s
cargo test (gadget-std)	56s
	2h 4m 55s

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