build(deps): bump pelago/emogrifier from 7.3.0 to 8.1.0

Bumps [pelago/emogrifier](https://github.com/MyIntervals/emogrifier) from 7.3.0 to 8.1.0.
- [Release notes](https://github.com/MyIntervals/emogrifier/releases)
- [Changelog](https://github.com/MyIntervals/emogrifier/blob/main/CHANGELOG.md)
- [Commits](MyIntervals/emogrifier@v7.3.0...v8.1.0)

---
updated-dependencies:
- dependency-name: pelago/emogrifier
  dependency-version: 8.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -37,7 +37,7 @@
         "mklkj/tinymce-i18n": "^25.2",
         "nnnick/chartjs": "^4.4",
         "openmage/composer-plugin": "^3.0",
-        "pelago/emogrifier": "^7.0",
+        "pelago/emogrifier": "^8.1",
         "phpseclib/mcrypt_compat": "^2.0.3",
         "phpseclib/phpseclib": "^3.0.14",
         "shardj/zf1-future": "^1.24.1",