docker/fedora: use meson from fedora repos

Fedora is still on version 0.49.2 while pip is on 0.50.
With the version from pip we can no longer run some gst-sharp tests
so we essentially revert back to 0.49

https://github.com/mesonbuild/meson/issues/5087

docker/fedora/prepare.sh

@@ -1,6 +1,6 @@
 set -eu
 
-dnf install -y git ninja-build dnf-plugins-core
+dnf install -y git meson ninja-build dnf-plugins-core
 
 # Configure git for various usage
 git config --global user.email "gst-build@gstreamer.net"
@@ -150,10 +150,6 @@ dnf debuginfo-install -y gtk3 \
     zip \
     zlib
 
-pip3 install meson
-# Add the pip3 installation to the path
-export PATH="$PATH:/usr/local/lib/python3.7/site-packages"
-
 # Install the dependencies of gstreamer
 dnf builddep -y gstreamer1 \
     gstreamer1-plugins-base \
@@ -168,8 +164,7 @@ dnf builddep -y gstreamer1 \
     gstreamer1-libav \
     gstreamer1-rtsp-server  \
     gstreamer1-vaapi \
-    python3-gstreamer1 \
-    -x meson
+    python3-gstreamer1
 
 # Remove gst-devel packages installed by builddep above
 dnf remove -y "gstreamer1*devel"