merge(3p/git): Merge git subtree at v2.29.2

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

third_party/git/po/TEAMS

@@ -43,9 +43,8 @@ Members:	Changwoo Ryu <cwryu@debian.org>
 		Sihyeon Jang <uneedsihyeon@gmail.com>
 
 Language:	pt_PT (Portuguese - Portugal)
-Repository:	https://github.com/vascool/git-po-pt/
-Leader:		Vasco Almeida <vascomalmeida@sapo.pt>
-Members:	Marco Sousa <marcomsousa AT gmail.com>
+Repository:	https://github.com/git-l10n-pt-PT/git-po/
+Leader:		Daniel Santos <hello@brighterdan.com>
 
 Language:	ru (Russian)
 Repository:	https://github.com/DJm00n/git-po-ru/
@@ -56,6 +55,10 @@ Language:	sv (Swedish)
 Repository:	https://github.com/nafmo/git-l10n-sv/
 Leader:		Peter Krefting <peter@softwolves.pp.se>
 
+Language:	tr (Turkish)
+Repository:	https://github.com/bitigchi/git-po/
+Leader:		Emir SARI <bitigchi@me.com>
+
 Language:	vi (Vietnamese)
 Repository:	https://github.com/vnwildman/git/
 Leader:		Trần Ngọc Quân <vnwildman AT gmail.com>
@@ -67,3 +70,8 @@ Leader:		Jiang Xin <worldhello.net AT gmail.com>
 Members:	Ray Chen <oldsharp AT gmail.com>
 		依云 <lilydjwg AT gmail.com>
 		Fangyi Zhou <me AT fangyi.io>
+
+Language:	zh_TW (Traditional Chinese)
+Respository:	https://github.com/l10n-tw/git-po
+Leader: 	Yi-Jyun Pan <pan93412 AT gmail.com>
+Members:	Franklin Weng <franklin AT goodhorse.idv.tw>