chore(deps): update tailwindcss monorepo to v4.0.15 (#1911)

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

Author: renovate[bot]

package.json

@@ -148,7 +148,7 @@
     "@primer/octicons-react": "19.15.1",
     "@primer/primitives": "10.4.0",
     "@primer/react": "36.27.0",
-    "@tailwindcss/postcss": "4.0.14",
+    "@tailwindcss/postcss": "4.0.15",
     "@testing-library/react": "16.2.0",
     "@types/jest": "29.5.14",
     "@types/node": "22.13.11",
@@ -179,7 +179,7 @@
     "semver": "7.7.1",
     "styled-components": "6.1.16",
     "tailwind-merge": "3.0.2",
-    "tailwindcss": "4.0.14",
+    "tailwindcss": "4.0.15",
     "terser-webpack-plugin": "5.3.14",
     "ts-jest": "29.2.6",
     "ts-loader": "9.5.2",