Merge pull request #19981 from timvandermeij/bump

Bump the stable version in `pdfjs.config`

Author: timvandermeij

pdfjs.config

@@ -1,5 +1,5 @@
 {
-  "stableVersion": "5.2.133",
+  "stableVersion": "5.3.31",
   "baseVersion": "2b9f621087a6c0b88f833936b488c927a38615cc",
   "versionPrefix": "5.3."
 }