composer(deps-dev): bump phpstan/phpstan from 2.3.1 to 2.3.4 (#2053)

* composer(deps-dev): bump phpstan/phpstan from 2.3.1 to 2.3.4

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan-phar-composer-source) from 2.3.1 to 2.3.4.
- [Commits](https://github.com/phpstan/phpstan-phar-composer-source/commits)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.3.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* phpstan-baseline.neon: update expected error pattern

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Daniel Scherzer <daniel.e.scherzer@gmail.com>

Author: dependabot[bot]

composer.lock

@@ -379,7 +379,7 @@ parameters:
 			path: include/langchooser.inc
 
 		-
-			message: '#^Binary operation "\." between non\-falsy\-string and 0\|0\.0\|''''\|array\{\}\|numeric\-string\|false\|null results in an error\.$#'
+			message: '#^Binary operation "\." between literal\-string&non\-falsy\-string and 0\|0\.0\|''''\|array\{\}\|numeric\-string\|false\|null results in an error\.$#'
 			identifier: binaryOp.invalid
 			count: 1
 			path: include/layout.inc