multiple_ports: Update MAINTAINER

Change uzsolt@uzsolt.hu to uzsolt@FreeBSD.org on all relevant ports:
audio/musicpc
converters/R-cran-jsonlite
databases/R-cran-cachem
databases/R-cran-fastmap
databases/adminer
deskutils/fet
devel/R-cran-cli
devel/R-cran-fansi
devel/R-cran-later
devel/R-cran-purrr
devel/R-cran-vctrs
devel/lua-sysctl
ftp/R-cran-curl
graphics/R-cran-colorspace
graphics/R-cran-ggrepel
graphics/R-cran-magick
graphics/diff-pdf
graphics/mupdf
graphics/timg
graphics/zathura-pdf-mupdf
mail/squirrelmail-translations
mail/squirrelmail
math/R-cran-gtable
math/R-cran-isoband
math/geogebra
misc/R-cran-xfun
misc/histring
print/R-cran-knitr
security/R-cran-digest
sysutils/hcloud
sysutils/py-rdiff-backup
textproc/R-cran-highr
textproc/R-cran-htmltools
textproc/R-cran-stringi
textproc/R-cran-stringr
textproc/R-cran-utf8
textproc/R-cran-yaml
textproc/urlview
www/kohana
x11-wm/herbstluftwm
x11/bemenu
x11/dzen2
x11/stalonetray

Approved by: bofh (mentor), diizzy (mentor)
Differential Revision: https://reviews.freebsd.org/D43614