chore: Post-release version bump to 0.4.0-rc #319

Job	Run time
Test (beta)	45s
Test (nightly)	35s
Cross Platform Build (ubuntu-latest)	1m 3s
Cross Platform Build (macos-latest)	1m 42s
Security Audit	14s
Test (stable)	1m 16s
Code Coverage	1m 35s
	7m 10s

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