Allow Fable 5 to be used with Fable 4 plugins #1653

Job	Run time
analyzers	3m 30s
build-dart	1m 58s
build-javascript (ubuntu-latest)	4m 15s
build-integration	3m 5s
build-javascript (windows-latest)	5m 48s
build-python (ubuntu-latest, 3.10)	2m 55s
build-rust (default)	3m 24s
build-standalone	6m 13s
build-typescript	2m 31s
build-rust (no_std)	3m 31s
build-python (ubuntu-latest, 3.11)	2m 58s
Check that solution can be restored	22s
build-rust (threaded)	4m 30s
build-python (ubuntu-latest, 3.12)	2m 53s
build-python (windows-latest, 3.10)	4m 7s
verify-linting	24s
build-python (windows-latest, 3.11)	4m 2s
build-python (windows-latest, 3.12)	4m 16s
	1h 0m 42s

Provide feedback