Update to 7-Zip Version 21.06

See https://sourceforge.net/p/sevenzip/discussion/45797/thread/b463f34259/

DOC/7zip.wxs

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 
 <?define VerMajor = "21" ?>
-<?define VerMinor = "04" ?>
+<?define VerMinor = "06" ?>
 <?define VerBuild = "00" ?>
 <?define MmVer = "$(var.VerMajor).$(var.VerMinor)" ?>
 <?define MmHex = "$(var.VerMajor)$(var.VerMinor)" ?>

DOC/readme.txt

@@ -1,4 +1,4 @@
-7-Zip 21.04 Sources
+7-Zip 21.05 Sources
 -------------------
 
 7-Zip is a file archiver for Windows. 

DOC/src-history.txt

@@ -1,6 +1,19 @@
 HISTORY of the 7-Zip source code
 --------------------------------
 
+21.06          2021-11-24
+-------------------------
+- Bug in LZMA encoder in file LzmaEnc.c was fixed:
+  LzmaEnc_MemEncode(), LzmaEncode() and LzmaCompress() could work incorrectly, 
+    if size value for output buffer is smaller than size required for all compressed data.
+  LzmaEnc_Encode() could work incorrectly,
+    if callback ISeqOutStream::Write() doesn't write all compressed data.
+  NCompress::NLzma::CEncoder::Code() could work incorrectly,
+    if callback ISequentialOutStream::Write() returns error code.
+- Bug in versions 21.00-21.05 was fixed:
+  7-Zip didn't set attributes of directories during archive extracting.
+
+
 21.04 beta     2021-11-02
 -------------------------
 - 7-Zip now reduces the number of working CPU threads for compression,