Slow greedy regex

[danielhollas]

Greedily matching numbers in F90_CONSTANTS_TYPES_RE is super slow for numbers with many digits.

https://github.com/pseewald/fprettify/blob/cb254022c2034ad3b8f744f4dad1bf5b7438815d/fprettify/__init__.py#L475

Kudos to @Jellby and @zaikunzhang for independently discovering this and fixing it as part of their PRs in
2f766f3 and bf41457, respectively.

Since those PRs are not yet merged, I am documenting the issue here for clarity. As one data point, parsing one file with 600 lines containing a lot of numbers went from 12s to 1s after the fix!