chore(deps): update dependency drupol/php-conventions to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
drupol/php-conventions	^5 -> ^6

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Release Notes

drupol/php-conventions (drupol/php-conventions)

### [`v6.0.0`](https://redirect.github.com/drupol/php-conventions/blob/HEAD/CHANGELOG.md#600) [Compare Source](https://redirect.github.com/drupol/php-conventions/compare/5.1.4...6.0.0) ##### Commits - chore: update changelog [`ce1d49c`](https://redirect.github.com/drupol/php-conventions/commit/ce1d49c2499e01eb618d8a5ae587066a12e380ca) - chore: regular maintenance [`b0b0dd3`](https://redirect.github.com/drupol/php-conventions/commit/b0b0dd3288b4dbc9c53c554dedfc31496fa28571)

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