MacOS CI: Update gstreamer version from 1.18.1 to 1.18.6

.github/workflows/macos_release.yml

@@ -48,8 +48,8 @@ jobs:
 
       - name: Install Gstreamer
         run: |
-            wget https://gstreamer.freedesktop.org/data/pkg/osx/1.18.1/gstreamer-1.0-devel-1.18.1-x86_64.pkg
-            wget https://gstreamer.freedesktop.org/data/pkg/osx/1.18.1/gstreamer-1.0-1.18.1-x86_64.pkg
+            wget https://gstreamer.freedesktop.org/data/pkg/osx/1.18.6/gstreamer-1.0-devel-1.18.6-x86_64.pkg
+            wget https://gstreamer.freedesktop.org/data/pkg/osx/1.18.6/gstreamer-1.0-1.18.6-x86_64.pkg
             for package in *.pkg ;
               do sudo installer -verbose -pkg "$package" -target /
             done

src/VideoReceiver/README.md

@@ -68,11 +68,11 @@ The build system is setup to use pkgconfig and it will find the necessary header
 
 ### Mac OS
 
-Download the gstreamer framework from here: http://gstreamer.freedesktop.org/data/pkg/osx. Supported version is 1.18.1. QGC may work with newer version, but it is untested.
+Download the gstreamer framework from here: http://gstreamer.freedesktop.org/data/pkg/osx. Supported version is 1.18.6. QGC may work with newer version, but it is untested.
 
 You need two packages:
-- [gstreamer-1.0-devel-1.18.1-x86_64.pkg](https://gstreamer.freedesktop.org/data/pkg/osx/1.18.1/gstreamer-1.0-devel-1.18.1-x86_64.pkg)
-- [gstreamer-1.0-1.18.1-x86_64.pkg](https://gstreamer.freedesktop.org/data/pkg/osx/1.18.1/gstreamer-1.0-1.18.1-x86_64.pkg)
+- [gstreamer-1.0-devel-1.18.6-x86_64.pkg](https://gstreamer.freedesktop.org/data/pkg/osx/1.18.6/gstreamer-1.0-devel-1.18.6-x86_64.pkg)
+- [gstreamer-1.0-1.18.6-x86_64.pkg](https://gstreamer.freedesktop.org/data/pkg/osx/1.18.6/gstreamer-1.0-1.18.6-x86_64.pkg)
 
 The installer places them under /Library/Frameworks/GStreamer.framework, which is where the QGC build system will look for it. That's all that is needed. When you build QGC and it finds the gstreamer framework, it automatically builds video streaming support.