Update dependency postcss to v8.5.3 (#1345)

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

bun.lock

@@ -60,7 +60,7 @@
         "micromark-extension-math": "3.1.0",
         "micromark-extension-mdxjs": "3.0.0",
         "pagefind": "1.3.0",
-        "postcss": "8.5.2",
+        "postcss": "8.5.3",
         "prettier": "3.5.1",
         "rehype-katex": "7.0.1",
         "rehype-pretty-code": "0.14.0",
@@ -1555,7 +1555,7 @@
 
     "possible-typed-array-names": ["[email protected]", "", {}, "sha512-d7Uw+eZoloe0EHDIYoe+bQ5WXnGMOpmiZFTuMWCwpjzzkL2nTjcKiAk4hh8TjnGye2TwWOk3UXucZ+3rbmBa8Q=="],
 
-    "postcss": ["[email protected].2", "", { "dependencies": { "nanoid": "^3.3.8", "picocolors": "^1.1.1", "source-map-js": "^1.2.1" } }, "sha512-MjOadfU3Ys9KYoX0AdkBlFEF1Vx37uCCeN4ZHnmwm9FfpbsGWMZeBLMmmpY+6Ocqod7mkdZ0DT31OlbsFrLlkA=="],
+    "postcss": ["[email protected].3", "", { "dependencies": { "nanoid": "^3.3.8", "picocolors": "^1.1.1", "source-map-js": "^1.2.1" } }, "sha512-dle9A3yYxlBSrt8Fu+IpjGT8SY8hN0mlaA6GY8t0P5PjIOZemULz/E2Bnm/2dcUOena75OTNkHI76uZBNUUq3A=="],
 
     "postcss-import": ["[email protected]", "", { "dependencies": { "postcss-value-parser": "^4.0.0", "read-cache": "^1.0.0", "resolve": "^1.1.7" }, "peerDependencies": { "postcss": "^8.0.0" } }, "sha512-hpr+J05B2FVYUAXHeK1YyI267J/dDDhMU6B6civm8hSY1jYJnBXxzKDKDswzJmtLHryrjhnDjqqp/49t8FALew=="],
 

package.json

@@ -66,7 +66,7 @@
     "micromark-extension-math": "3.1.0",
     "micromark-extension-mdxjs": "3.0.0",
     "pagefind": "1.3.0",
-    "postcss": "8.5.2",
+    "postcss": "8.5.3",
     "prettier": "3.5.1",
     "rehype-katex": "7.0.1",
     "rehype-pretty-code": "0.14.0",