devel/fmt: drop maintainer

I no longer have an interest in maintaining this, so this diff removes
me as maintainer. Thanks.

Index: devel/fmt/Makefile
===================================================================
RCS file: /cvs/ports/devel/fmt/Makefile,v
retrieving revision 1.4
diff -u -p -u -p -r1.4 Makefile
--- devel/fmt/Makefile 11 Mar 2022 18:50:03 -0000 1.4
+++ devel/fmt/Makefile 6 Apr 2022 00:30:55 -0000
@@ -3,12 +3,11 @@ COMMENT= alternative formatting library
GH_ACCOUNT= fmtlib
GH_PROJECT= fmt
GH_TAGNAME= 8.0.1
+REVISION= 1

SHARED_LIBS= fmt 1.0

CATEGORIES= devel
-
-MAINTAINER= Ashton Fagg <ashton@fagg.id.au>

# MIT
PERMIT_PACKAGE= Yes