docker: fedora: Add intel-mediasdk package.

Add intel-mediasdk package to build gst-msdk plugin in gst-plugins-bad.

Part-of: <!403>

docker/fedora/prepare.sh

@@ -22,6 +22,7 @@ dnf install -y \
     aalib-devel \
     aom \
     bat \
+    intel-mediasdk-devel \
     libaom \
     libaom-devel \
     libcaca-devel \

gitlab/ci_template.yml

@@ -21,7 +21,7 @@ variables:
   # If you are hacking on them or need a them to rebuild, its enough
   # to change any part of the string of the image you want.
   ###
-  FEDORA_TAG:  '2021-06-07.0'
+  FEDORA_TAG:  '2021-06-09.0'
   CERBERO_TAG: '2020-10-22.0'
   ANDROID_TAG: '2020-10-22.0'
   MANIFEST_TAG: '2020-10-22.0'