edited the selenium/video image tag to fix issue# 1120 (#1123)

Co-authored-by: Diego Molina <[email protected]>

Author: amuthansakthivel

docker-compose-v3-video.yml

@@ -43,7 +43,7 @@ services:
       - "6902:5900"
 
   chrome_video:
-    image: selenium/video:ffmpeg-4.3.1-20200920
+    image: selenium/video:ffmpeg-4.3.1-20200921
     volumes:
       - /tmp/videos:/videos
     depends_on:
@@ -53,7 +53,7 @@ services:
       - FILE_NAME=chrome_video.mp4
 
   firefox_video:
-    image: selenium/video:ffmpeg-4.3.1-20200920
+    image: selenium/video:ffmpeg-4.3.1-20200921
     volumes:
       - /tmp/videos:/videos
     depends_on: