[Filesystem] addressed == -> === suggestion

| Q             | A
| ------------- | ---
| Bug fix?      | sort of
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | na

https://github.com/symfony/symfony/pull/9899/files#r8592132