elpaca-test: make mapconcat work on Emacs 27.x and 28.x
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`mapconcat` requires `SEPARATOR` argument which became optional (`""`) in later versions. Running on older versions crashes `elpaca-test.el` with: ``` elpaca-test.el:109:6: Warning: mapconcat called with 2 arguments, but requires 3 ``` Ref: github.com/emacs-mirror/emacs/blob/647a935/src/fns.c#L2681 Ref: github.com/emacs-mirror/emacs/blob/dec9582/src/fns.c#L2858 Ref: github.com/emacs-mirror/emacs/blob/75ca15f/src/fns.c#L3049
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mapconcatrequiresSEPARATORargument which became optional ("") in later versions. Running on older versions crasheselpaca-test.elwith:Ref: https://github.com/emacs-mirror/emacs/blob/647a935/src/fns.c#L2681
Ref: https://github.com/emacs-mirror/emacs/blob/dec9582/src/fns.c#L2858
Ref: https://github.com/emacs-mirror/emacs/blob/75ca15f/src/fns.c#L3049