Upgrade Rust to version 1.76 #5444

Job	Run time
ln-dlc-node-tests	6m 32s
formatting-dprint	18s
generate-ffi	3m 16s
lint-commits	7s
e2e_tests_prepare	10m 12s
clippy	3m 35s
payout-curve	2m 15s
Format and lint Flutter code	55s
unit-tests	9m 8s
e2e-tests (./target/debug/deps/e2e_basic-32ae9b8846847b87)	2m 5s
e2e-tests (./target/debug/deps/e2e_close_position-9a24419b82daef67)	3m 2s
e2e-tests (./target/debug/deps/e2e_collaborative_close_channel-45247dc794f29cf5)	3m 2s
e2e-tests (./target/debug/deps/e2e_collaborative_revert-0c4bba3e30b05666)	2m 53s
e2e-tests (./target/debug/deps/e2e_force_close_position-289408620cf52376)	2m 32s
e2e-tests (./target/debug/deps/e2e_open_position-e60f0ec0f0bd44ca)	2m 1s
e2e-tests (./target/debug/deps/e2e_open_position_small_utxos-ba89a468e7190e37)	2m 25s
e2e-tests (./target/debug/deps/e2e_reject_offer-338c95a574b4b801)	2m 19s
e2e-tests (./target/debug/deps/e2e_restore_from_backup-ee4bc4aeee8f1683)	2m 45s
e2e-tests (./target/debug/deps/e2e_rollover_position-5e818e1d8e0eeca9)	2m 41s
e2e_tests_check	1s
	1h 2m 4s

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