rename: invalid -> incompatible cache header #56240
Merged
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Falling back to the older serial precompilation process is basically a bug (except for if a manifest hasn't been resolved) so #52619 added more info on why it's been hit so we have a chance of fixing issues that are otherwise very difficult to recreate.
However "invalid header" which usually just means it was made by a different julia version appears to sound too alarming to users. https://discourse.julialang.org/t/cache-misses-when-using-packages-since-upgrading-to-1-11/121445
So soften it there and in error messages, given it seems a better description.
Suggested by @giordano in https://discourse.julialang.org/t/cache-misses-when-using-packages-since-upgrading-to-1-11/121445/4?u=ianshmean