Merge pull request #20875 from Snuffleupagus/version-5.6

Bump library version to `5.6`

Author: timvandermeij

pdfjs.config

@@ -1,5 +1,5 @@
 {
   "stableVersion": "5.5.207",
-  "baseVersion": "025d658a9c66d10825ce19bc830e52a8c6347e61",
-  "versionPrefix": "5.5."
+  "baseVersion": "315491dd3224d957f203f813f880b26cc3251bae",
+  "versionPrefix": "5.6."
 }