Update maintainer and author info.

The other maintainer suddenly disappeared.

(cherry picked from commit 77a294d98a)

AUTHORS

@@ -2,8 +2,8 @@
 Authors of XZ Utils
 ===================
 
-    XZ Utils is developed and maintained by Lasse Collin
-    <lasse.collin@tukaani.org> and Jia Tan <jiat0218@gmail.com>.
+    XZ Utils is developed and maintained by
+    Lasse Collin <lasse.collin@tukaani.org>.
 
     Major parts of liblzma are based on code written by Igor Pavlov,
     specifically the LZMA SDK <https://7-zip.org/sdk.html>. Without
@@ -30,6 +30,11 @@ Authors of XZ Utils
       - Jonathan Nieder
       - Joachim Henke
 
+    Special author: Jia Tan was a co-maintainer in 2022-2024. He and
+    the team behind him inserted a backdoor (CVE-2024-3094) into
+    XZ Utils 5.6.0 and 5.6.1 releases. He suddenly disappeared when
+    this was discovered.
+
     Many people have contributed improvements or reported bugs.
     Most of these people are mentioned in the file THANKS.
 

README

@@ -300,11 +300,7 @@ XZ Utils
 6. Contact information
 ----------------------
 
-    If you have questions, bug reports, patches etc. related to XZ Utils,
-    the project maintainers Lasse Collin and Jia Tan can be reached via
-    <xz@tukaani.org>.
-
-    You might find Lasse also from #tukaani on Libera Chat (IRC).
-    The nick is Larhzu. The channel tends to be pretty quiet,
-    so just ask your question and someone might wake up.
+    Email: Lasse Collin <lasse.collin@tukaani.org>
+    IRC: Larhzu on #tukaani on Libera Chat
+    GitHub: https://github.com/tukaani-project/xz
 

THANKS

@@ -152,7 +152,6 @@ has been important. :-) In alphabetical order:
   - Martin Storsjö
   - Jonathan Stott
   - Dan Stromberg
-  - Jia Tan
   - Vincent Torri
   - Alexey Tourbin
   - Paul Townsend

src/liblzma/api/lzma.h

@@ -12,7 +12,7 @@
  *
  * liblzma is part of XZ Utils <https://tukaani.org/xz/>. XZ Utils
  * includes a gzip-like command line tool named xz and some other tools.
- * XZ Utils is developed and maintained by Lasse Collin and Jia Tan.
+ * XZ Utils is developed and maintained by Lasse Collin.
  *
  * Major parts of liblzma are based on code written by Igor Pavlov,
  * specifically the LZMA SDK <https://7-zip.org/sdk.html>.