update submodules

GerHobbelt · GerHobbelt · commit 1e66fcfe813b · 2021-01-10T22:31:26.000+01:00
diff --git a/Lucene.NET b/Lucene.NET
@@ -1 +1 @@
-Subproject commit 947c21dec46e7afd7b2690106682624f0aaad99d
+Subproject commit 6252496527f9e99fa305b7933ba994546602c026
diff --git a/MuPDF b/MuPDF
@@ -1 +1 @@
-Subproject commit e14057aaa62e53ad769781c4e6120ba4736efb1a
+Subproject commit 3c9f877600a84a8d6cd153910d526352b0276907
