Remove @tiran from CODEOWNERS (python#139513)

Christian Heimes is now inactive for 2 years.

Author: vstinner

.github/CODEOWNERS

@@ -241,10 +241,10 @@ Lib/test/test_getpath.py      @FFY00
 Modules/getpath*              @FFY00
 
 # Hashing / ``hash()`` and related
-Include/cpython/pyhash.h         @gpshead @picnixz @tiran
-Include/internal/pycore_pyhash.h @gpshead @picnixz @tiran
-Include/pyhash.h                 @gpshead @picnixz @tiran
-Python/pyhash.c                  @gpshead @picnixz @tiran
+Include/cpython/pyhash.h         @gpshead @picnixz
+Include/internal/pycore_pyhash.h @gpshead @picnixz
+Include/pyhash.h                 @gpshead @picnixz
+Python/pyhash.c                  @gpshead @picnixz
 
 # The import system (including importlib)
 **/*import*                   @brettcannon @ericsnowcurrently @ncoghlan @warsaw
@@ -371,14 +371,14 @@ Lib/calendar.py               @AA-Turner
 Lib/test/test_calendar.py     @AA-Turner
 
 # Cryptographic Primitives and Applications
-**/*hashlib*                  @gpshead @picnixz @tiran
-**/*hashopenssl*              @gpshead @picnixz @tiran
+**/*hashlib*                  @gpshead @picnixz
+**/*hashopenssl*              @gpshead @picnixz
 **/*hmac*                     @gpshead @picnixz
 **/*ssl*                      @gpshead @picnixz
 Modules/_hacl/                @gpshead @picnixz
-Modules/*blake*               @gpshead @picnixz @tiran
-Modules/*md5*                 @gpshead @picnixz @tiran
-Modules/*sha*                 @gpshead @picnixz @tiran
+Modules/*blake*               @gpshead @picnixz
+Modules/*md5*                 @gpshead @picnixz
+Modules/*sha*                 @gpshead @picnixz
 
 # Codecs
 Modules/cjkcodecs/            @corona10