chore(deps): update dependency tailwind-merge to v2.6.0 (#2131)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/react-email/package.json

@@ -84,7 +84,7 @@
     "source-map-js": "1.0.2",
     "spamc": "0.0.5",
     "stacktrace-parser": "0.1.11",
-    "tailwind-merge": "2.2.0",
+    "tailwind-merge": "2.6.0",
     "tailwindcss": "3.4.0",
     "tsup": "7.2.0",
     "tsx": "4.19.3",