Removal of several rules.

[rickprent]

The following rules have been removed by their managing repositories:

- Generic.Formatting.MultipleStatementAlignment
    * ignoreMultiLine
- SlevomatCodingStandard.TypeHints.DeclareStrictTypes
    * newlinesCountBetweenOpenTagAndDeclare
    * newlinesCountAfterDeclare

This is now an issue because of https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/CHANGELOG.md?plain=1#L77, which results in the following errors:

ERROR: Ruleset invalid. Property "ignoreMultiLine" does not exist on sniff Generic.Formatting.MultipleStatementAlignment

ERROR: Ruleset invalid. Property "newlinesCountBetweenOpenTagAndDeclare" does not exist on sniff SlevomatCodingStandard.TypeHints.DeclareStrictTypes

ERROR: Ruleset invalid. Property "newlinesCountAfterDeclare" does not exist on sniff SlevomatCodingStandard.TypeHints.DeclareStrictTypes

The references to the removal of these rules in their managing repositories:
https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/CHANGELOG.md?plain=1#L3475
slevomat/coding-standard@b71f8d7
slevomat/coding-standard@a623909