Refine stability rules for diesel release #4503
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This commit explicitly outlines that we might perform otherwise considered breaking changes in minor releases if that's required by build breaking changes from the rust project itself. A previous example of such a change that nearly required us to make such a breaking change in diesel is the change to default to
resolver = "2"
with the 2021 edition. I rather want to make sure that we don't end up in a similar situation in the future that requires us to issue a new major diesel version just to sidestep0breakage from their side.