Update dependency mjml to v5

Author: renovate[bot]

package.json

@@ -140,7 +140,7 @@
 		"@types/d3": "7.4.3",
 		"@types/jest": "30.0.0",
 		"@types/markdown-it": "14.1.2",
-		"@types/mjml": "4.7.4",
+		"@types/mjml": "5.0.0",
 		"@types/node": "25.6.2",
 		"@types/react": "19.2.14",
 		"@types/react-copy-to-clipboard": "5.0.7",
@@ -178,7 +178,7 @@
 		"localga": "3.0.0",
 		"markdown-it": "14.1.1",
 		"markdown-it-prism": "3.0.1",
-		"mjml": "4.18.0",
+		"mjml": "5.2.0",
 		"package-info": "5.0.7",
 		"postcss": "8.5.14",
 		"postcss-browser-comments": "7.0.0",