chore(ci): adjust phpunit and phpstan configs

phpstan.neon

@@ -2,15 +2,15 @@ parameters:
   level: 6
   ignoreErrors:
   -
-    message: "#^Strict comparison using !== between '' and non-empty-string will always evaluate to true.$#"
+    rawMessage: "Strict comparison using !== between '' and non-empty-string will always evaluate to true."
     count: 1
     path: lib/Auth/Digest.php
   -
-    message: "#^Casting to string something that's already string.$#"
+    rawMessage: "Casting to string something that's already string."
     count: 1
     path: lib/Sapi.php
   -
-    message: "#^Strict comparison using === between null and array<string, mixed> will always evaluate to false.$#"
+    rawMessage: "Strict comparison using === between null and array<string, mixed> will always evaluate to false."
     count: 1
     path: lib/functions.php
   -

tests/phpunit.xml

@@ -1,5 +1,15 @@
 <?xml version="1.0"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" beStrictAboutOutputDuringTests="true" beStrictAboutTestsThatDoNotTestAnything="true" failOnRisky="true" failOnWarning="true" bootstrap="bootstrap.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" cacheDirectory=".phpunit.cache" beStrictAboutCoverageMetadata="true">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         colors="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTestsThatDoNotTestAnything="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         failOnDeprecation="true"
+         bootstrap="bootstrap.php"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+         cacheDirectory=".phpunit.cache" beStrictAboutCoverageMetadata="true"
+>
   <testsuites>
     <testsuite name="Sabre_HTTP">
       <directory>HTTP/</directory>