meson: Bump to 0.50.0

This fixes a build-time warning stating that the install arg in
configure_file has been introduced in 0.50.0.
12 jobs for bump-meson in 5 minutes and 5 seconds (queued for 2 minutes and 17 seconds)
latest
Name Stage Failure
failed
build-debian-gcc Build
Build type: native build

meson.build:1:0: ERROR: Meson version is 0.49.2 but project requires >= 0.50.0.

A full log can be found at /builds/adrien.plazas/libhandy/_build/meson-logs/meson-log.txt
Uploading artifacts...
_build: found 5 matching files
Uploading artifacts to coordinator... ok
id=263904 responseStatus=201 Created token=LskXs3Lh
ERROR: Job failed: exit code 1
failed
build-fedora-gcc Build

Total download size: 52 M
Downloading Packages:

The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.
Error: Error downloading packages:
Curl error (28): Timeout was reached for https://mirrors.fedoraproject.org/metalink?repo=updates-released-f29&arch=x86_64 [Connection timed out after 30002 milliseconds]
ERROR: Job failed: exit code 1
failed
build-debian-clang Build
Build type: native build

meson.build:1:0: ERROR: Meson version is 0.49.2 but project requires >= 0.50.0.

A full log can be found at /builds/adrien.plazas/libhandy/_build/meson-logs/meson-log.txt
Uploading artifacts...
WARNING: _build/meson-logs/scanbuild: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1