bpo-34631: Updated OpenSSL to 1.1.1c in Windows installer (GH-14163)

diff --git a/PCbuild/python.props b/PCbuild/python.props
index b13837d..0f93a00 100644
--- a/PCbuild/python.props
+++ b/PCbuild/python.props
@@ -62,8 +62,8 @@
     <libffiDir>$(ExternalsDir)libffi\</libffiDir>
     <libffiOutDir>$(ExternalsDir)libffi\$(ArchName)\</libffiOutDir>
     <libffiIncludeDir>$(libffiOutDir)include</libffiIncludeDir>
-    <opensslDir>$(ExternalsDir)openssl-1.1.1b\</opensslDir>
-    <opensslOutDir>$(ExternalsDir)openssl-bin-1.1.1b\$(ArchName)\</opensslOutDir>
+    <opensslDir>$(ExternalsDir)openssl-1.1.1c\</opensslDir>
+    <opensslOutDir>$(ExternalsDir)openssl-bin-1.1.1c\$(ArchName)\</opensslOutDir>
     <opensslIncludeDir>$(opensslOutDir)include</opensslIncludeDir>
     <nasmDir>$(ExternalsDir)\nasm-2.11.06\</nasmDir>
     <zlibDir>$(ExternalsDir)\zlib-1.2.11\</zlibDir>