Update dependency phpstan/phpstan to v0.12.18

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	0.12.17 -> 0.12.18

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Release Notes

phpstan/phpstan

v0.12.18

Compare Source

Improvements 🔧

Dedicated CLI option --generate-baseline with improved DX (phpstan/phpstan-src@f4a9d5f), #​3082, #​2703, #​2776, #​2695, #​2534

Use it from now on instead of --error-format baselineNeon. Here are the advantages:

1. The current baseline file does not have to be commented-out nor emptied when generating the new baseline. It's excluded automatically.
2. Output no longer has to be redirected to a file, PHPStan saves the baseline to a specified path (defaults to phpstan-baseline.neon).
3. Baseline contains correct relative paths if saved to a subdirectory.

Bugfixes 🐛

• Fix reporting unmatched ignored error from path that wasn't analysed (phpstan/phpstan-src@c9df2f4), #​3099

Function signature fixes 🤖

• Fix bcdiv return (#​167), thanks @​BackEndTea!
• Fix other bc* function types (#​168), thanks @​BackEndTea!

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