Bump postcss from 8.5.15 to 8.5.16 in the postcss group across 1 directory (#9382)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -151,7 +151,7 @@
     "micromatch": "^4.0.8",
     "normalize-path": "^3.0.0",
     "picocolors": "^1.1.1",
-    "postcss": "^8.5.15",
+    "postcss": "^8.5.16",
     "postcss-safe-parser": "^7.0.1",
     "postcss-selector-parser": "^7.1.4",
     "postcss-value-parser": "^4.2.0",