Poetry 2.0.0 launched yesterday. Since the dependency range of this package is (>=1.2.0.a2,<2.0.0), installation fails.
Using version ^0.3.6 for poetry-exec-plugin
Updating dependencies
Resolving dependencies...
Because no versions of poetry-exec-plugin match >0.3.6,<0.4.0
and poetry-exec-plugin (0.3.6) depends on poetry (>=1.2.0.a2,<2.0.0), poetry-exec-plugin (>=0.3.6,<0.4.0) requires poetry (>=1.2.0.a2,<2.0.0).
So, because poetry-instance depends on both poetry (2.0.0) and poetry-exec-plugin (^0.3.6), version solving failed.
Poetry 2.0.0 launched yesterday. Since the dependency range of this package is (>=1.2.0.a2,<2.0.0), installation fails.