meson: Bump required version to 0.54

Fixes:
WARNING: Project targeting '>= 0.48' but tried to use feature introduced in '0.54.0': native arg in add_languages
31 jobs for !655 with fatal-meson-warnings in 3 minutes and 37 seconds (queued for 16 seconds)
latest detached
Status Job ID Name Coverage
  Build Docker
passed #3372412
alpine amd64 manifest builder docker

00:01:36

passed #3372411
android docker

00:02:33

passed #3372410
cerbero fedora amd64 docker

00:03:14

passed #3372409
fedora amd64 docker

00:03:17

passed #3372413
gst-indent amd64 docker

00:01:44

 
  Preparation
passed #3372415
gst indent

00:00:20

manual #3372414
manual
manifest
 
  Build
created #3372424
gstreamer
build cerbero cross-android universal
created #3372428
gst-ios-13.2
build cerbero cross-ios universal
created #3372425
gstreamer
build cerbero cross win32
created #3372426
gstreamer
build cerbero cross win64
created #3372423
gstreamer
build cerbero fedora x86_64
created #3372427
gst-macos-10.15
build cerbero macos x86_64
created #3372419
build clang fedora x86_64
created #3372422
1809 windows docker allowed to fail manual
build msys2
created #3372416
build nodebug fedora x86_64
created #3372417
build static fedora x86_64
created #3372418
build static nodebug fedora x86_64
created #3372420
1809 windows docker
build vs2017 amd64
created #3372421
1809 windows docker
build vs2017 x86
 
  Test
created #3372429
gstreamer
check fedora
created #3372430
gstreamer
integration testsuites fedora 1/4
created #3372431
gstreamer
integration testsuites fedora 2/4
created #3372432
gstreamer
integration testsuites fedora 3/4
created #3372433
gstreamer
integration testsuites fedora 4/4
created #3372435
gstreamer
valgrind bad
created #3372436
gstreamer
valgrind ges
created #3372434
gstreamer
valgrind good
 
  Integrate
created #3372437
cross-android universal examples
created #3372439
gst-ios-13.2
cross-ios universal examples
created #3372438
documentation