MAINTAINERS: git://github -> https://github.com for terrelln

Github deprecated the git:// links about a year ago, so let's move to
the https:// URLs instead.

Reported-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://github.blog/2021-09-01-improving-git-protocol-security-github/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Nick Terrell <terrelln@fb.com>

MAINTAINERS

@@ -22800,7 +22800,7 @@ ZSTD
 M:	Nick Terrell <terrelln@fb.com>
 S:	Maintained
 B:	https://github.com/facebook/zstd/issues
-T:	git git://github.com/terrelln/linux.git
+T:	git https://github.com/terrelln/linux.git
 F:	include/linux/zstd*
 F:	lib/zstd/
 F:	lib/decompress_unzstd.c