Release 2.3.3

2.3.3 (2023-06-09)

• #89: Call static assert functions with self:: (tests only) (@phil-davis)
• #90: Implement phpstan strict rules and fix edge cases for paths that have "0" (@phil-davis)
• #91: Use newer GitHub workflow action versions (CI only) (@phil-davis)
• #93: Minor cs-fixer change (@phil-davis)

Note: This is a patch release for the "old" major version 2 series. There will also be a 3.0.1 release coming with the same patches for the current major version 3.