fix(kernel/type_checker): disable expression caching in asynchronous proof checking
fix(kernel/type_checker): disable expression caching in asynchronous proof checking

leodemoura/lean,leanprover-community/lean,leanprover-community/lean,leodemoura/lean,avigad/lean,leodemoura/lean,rlewis1988/lean,dselsam/lean,dselsam/lean,leanprover/lean,Kha/lean,rlewis1988/lean,dselsam/lean,johoelzl/lean,digama0/lean,Kha/lean,avigad/lean,johoelzl/lean,Kha/lean,digama0/lean,leanprover-community/lean,leanprover-community/lean,leanprover/lean,Kha/lean,digama0/lean,leanprover-community/lean,dselsam/lean,leanprover-community/lean,johoelzl/lean,leanprover/lean,leanprover/lean,digama0/lean,rlewis1988/lean,fpvandoorn/lean,fpvandoorn/lean,rlewis1988/lean,Kha/lean,fpvandoorn/lean,digama0/lean,leanprover/lean,avigad/lean,leodemoura/lean,rlewis1988/lean,Kha/lean,avigad/lean,avigad/lean,johoelzl/lean,rlewis1988/lean,leanprover/lean,leodemoura/lean,fpvandoorn/lean,avigad/lean,leodemoura/lean,fpvandoorn/lean,dselsam/lean,digama0/lean,fpvandoorn/lean,johoelzl/lean,johoelzl/lean,dselsam/lean