[TASK] Raise PHPStan to level 10

Level 10 is PHPStan's "up to 11", which was introduced
in PHPStan 2.

https://en.wikipedia.org/wiki/Up_to_eleven

config/phpstan-baseline.neon

@@ -24,6 +24,18 @@ parameters:
 			count: 1
 			path: ../src/CssInliner.php
 
+		-
+			message: '#^Parameter \#1 \$matches of method Pelago\\Emogrifier\\CssInliner\:\:replaceUnmatchableNotComponent\(\) expects array\<string\>, array given\.$#'
+			identifier: argument.type
+			count: 1
+			path: ../src/CssInliner.php
+
+		-
+			message: '#^Parameter \#1 \$name of method Pelago\\Emogrifier\\Utilities\\DeclarationBlockParser\:\:normalizePropertyName\(\) expects non\-empty\-string, mixed given\.$#'
+			identifier: argument.type
+			count: 1
+			path: ../src/CssInliner.php
+
 		-
 			message: '#^Parameter \#1 \$html of method Pelago\\Emogrifier\\HtmlProcessor\\AbstractHtmlProcessor\:\:removeSelfClosingTagsClosingTags\(\) expects string, string\|false given\.$#'
 			identifier: argument.type
@@ -162,6 +174,12 @@ parameters:
 			count: 1
 			path: ../src/Utilities/Preg.php
 
+		-
+			message: '#^Cannot cast mixed to int\.$#'
+			identifier: cast.int
+			count: 1
+			path: ../tests/Support/Constraint/CssConstraint.php
+
 		-
 			message: '''
 				#^@dataProvider provideInvalidAtCharsetRuleWhichCausesException

config/phpstan.neon

@@ -2,7 +2,7 @@ includes:
   - phpstan-baseline.neon
 
 parameters:
-  level: 9
+  level: 10
 
   paths:
     - %currentWorkingDirectory%/src/