Elixir CI

ci: bump actions/cache to v4 #792

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9 warnings

redefining module Abc.Def.MyForeignEnum (current version defined in memory)

redefining module Abc.Def.Proto3.NestedEnum (current version defined in memory)

redefining module Proto2A.NestedEnum (current version defined in memory)

redefining module Abc.Def.EmptyProto3 (current version defined in memory)

redefining module Abc.Def.Proto3 (current version defined in memory)

redefining module Proto2A (current version defined in memory)

redefining module Proto2A.NestedMessage (current version defined in memory)

redefining module Proto2B (current version defined in memory)

redefining module SeveralRequired (current version defined in memory)