json: replaced simplejson with orjson

requirements.txt

@@ -18,6 +18,7 b' mercurial==6.3.3'
 mock==5.0.1
 more-itertools==9.1.0
 msgpack-python==0.5.6
+orjson==3.8.7
 psutil==5.9.4
 py==1.11.0
 pygit2==1.11.1
@@ -41,7 +42,6 b' redis==4.5.1'
 repoze.lru==0.7
 scandir==1.10.0
 setproctitle==1.3.2
-simplejson==3.18.3
 subvertpy==0.11.0
 wcwidth==0.2.6
 

vcsserver/lib/rc_json.py

@@ -1,1 +1,2 b''
-import simplejson as json
+# use orjson by default
+import orjson as json