[BUGFIX] Bump symfony/polyfill-mbstring to ^1.16

ext:frontend uses the function mb_ord which is available since
symfony/polyfill-mbstring v1.16 and to avoid issue this dependency is
properly increased and also added to ext:frontend.

Composer commands used:
* composer require "symfony/polyfill-mbstring:^1.16"
* composer require --no-update -d typo3/sysext/core "symfony/polyfill-mbstring:^1.16"
* composer require --no-update -d typo3/sysext/frontend "symfony/polyfill-mbstring:^1.16"

Resolves: #95279
Releases: master, 10.4, 9.5
Change-Id: I31aa9affa936ae96d5a02ad846aa011fb89af75d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71127
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

composer.json

@@ -78,7 +78,7 @@
 		"symfony/polyfill-intl-icu": "^1.6",
 		"symfony/polyfill-intl-idn": "^1.10",
 		"symfony/polyfill-intl-normalizer": "^1.22",
-		"symfony/polyfill-mbstring": "^1.2",
+		"symfony/polyfill-mbstring": "^1.16",
 		"symfony/polyfill-php80": "^1.16",
 		"symfony/property-access": "^5.3.0",
 		"symfony/property-info": "^5.3.0",

typo3/sysext/core/composer.json

@@ -63,7 +63,7 @@
 		"symfony/polyfill-intl-icu": "^1.6",
 		"symfony/polyfill-intl-idn": "^1.10",
 		"symfony/polyfill-intl-normalizer": "^1.22",
-		"symfony/polyfill-mbstring": "^1.2",
+		"symfony/polyfill-mbstring": "^1.16",
 		"symfony/rate-limiter": "^5.3",
 		"symfony/routing": "^5.3.0",
 		"symfony/yaml": "^5.3.0",

typo3/sysext/frontend/composer.json

@@ -20,6 +20,7 @@
 	},
 	"require": {
 		"ext-libxml": "*",
+		"symfony/polyfill-mbstring": "^1.16",
 		"typo3/cms-core": "11.5.*@dev"
 	},
 	"conflict": {