Update rtt-target requirement from 0.3.1 to 0.4.0 in /rtic_v1/stm32l4_heartbeat

[dependabot[bot]]

Updates the requirements on rtt-target to permit the latest version.

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[AfoHT]

Blocked by https://github.com/probe-rs/rtt-target/issues/33

[AfoHT]

@dependabot rebase