control: Add meson to Build-Depends

[ryonakano]

Fixes the build failing on Launchpad (I didn't noticed we're missing this in #24 😵 )

https://launchpadlibrarian.net/860025193/buildlog_ubuntu-resolute-amd64.elementary-fonts_5.1.0-0+44~daily~ubuntu26.04.1_BUILDING.txt.gz

dh_auto_configure: warning: Use of debian/compat is deprecated and will be removed in debhelper (>= 14~).
Can't exec "meson": No such file or directory at /usr/share/perl5/Debian/Debhelper/Dh_Lib.pm line 553.
dh_auto_configure: error: exec (for cmd: meson --version) failed: No such file or directory
dh_auto_configure: error: meson --version returned exit code 255
make: *** [debian/rules:13: binary] Error 255
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2

I locally confirmed dpkg-buildpackage -us -uc succeeds with this branch.

[danirabbit]

🎉