[vim/vim] Add \- as a synonym to \{-\} in magic mode (Issue #20953)

mazunki created an issue (vim/vim#20953)

**Is your feature request about something that is currently impossible or hard to do? Please describe the problem.**
It's sometimes tedious to escape substitution patterns. Given a set of variables like `{{foo}}` where we want the output `{{FOO}}`, a solution would be `:%s/{{[^}]\+}}/\U&/g` in magic mode, and `:%s/{{\[^}\]}}/\U&/` in nomagic mode. Thanks to the non-greedy `\{-\}`, this can be rewritten as `:%s/{{.\{-\}}}/\U&/g`, which is slightly more readable.

Ideally, I'd like to be able to rewrite this as `:%s/{{.\-}}/\U&/g`. To me and others, this seems far more readable. 

**Describe the solution you'd like**
Currently, we have `\+` for both magic and nomagic modes. We have `*` in magic mode, and `\*` in no-magic mode.

I'm suggesting that `\{-\}` remains unchanged for no-magic mode, but allows for `\-` as a synonym to `\{-\}` in magic and verymagic modes.  Other flavour of regex have `.*?` for the same thing. I think `\-` makes sense since we already have `\+` which has a similar role.

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This should not affect consumers, since `/\\` clearly states that "_A backslash followed by a single character, with no special meaning, is reserved for future expansions_".

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