pubs: fix test broken by PyYAML 5.1

pkgs/tools/misc/pubs/default.nix

···
     sha256 = "16zwdqfbmlla6906g3a57a4nj8wnl11fq78r20qms717bzv211j0";
   };
 
-  # Fix for bibtexparser 1.1.0
-  patches = fetchpatch {
-    url = https://github.com/pubs/pubs/pull/185/commits/e58ae98b93b8364a07fd5f5f452ba88ad332c948.patch;
-    sha256 = "1n7zrk119v395jj8wqg8wlymc9l9pq3v752yy3kam9kflc0aashp";
-  };
+  patches = [
+    # Fix for bibtexparser 1.1.0
+    (fetchpatch {
+      url = https://github.com/pubs/pubs/pull/185/commits/e58ae98b93b8364a07fd5f5f452ba88ad332c948.patch;
+      sha256 = "1n7zrk119v395jj8wqg8wlymc9l9pq3v752yy3kam9kflc0aashp";
+    })
+    # Fix test broken by PyYAML 5.1
+    (fetchpatch {
+      url = https://github.com/pubs/pubs/pull/194/commits/c3cb713ae76528eeeaaeb948fe319a76ab3934d8.patch;
+      sha256 = "05as418m7wzs65839bb91b2jrs8l68z8ldcjcd9cn4b9fcgsf3rk";
+    })
+  ];
 
   propagatedBuildInputs = with python3Packages; [
     argcomplete dateutil configobj feedparser bibtexparser pyyaml requests six beautifulsoup4