Update media_app to ZF_pgjG6rhfxsI1g17CmHTot4WuP2GZTEgUV2qEN0E8C CIPD package.

CIPD package: https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/media_app/app/+/ZF_pgjG6rhfxsI1g17CmHTot4WuP2GZTEgUV2qEN0E8C

Release notes: http://go/media_app-x20/relnotes/Stable/media_app_20200806_RC00.html

Bug: b/162102218, b/161761740, b/162996761, b/162541639, b/162542166

Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Change-Id: Ieaa73d30bee08fc32f1ff945457f3b10ea6fcd5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342225
Auto-Submit: Trent Apted <tapted@chromium.org>
Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795778}

DEPS

@@ -1556,7 +1556,7 @@ deps = {
     'packages': [
       {
         'package': 'chromeos_internal/apps/media_app/app',
-        'version': '1izNFT_phlvwP0ztDjyMFLL16mHtl9k3RMudmVlRzkkC',
+        'version': 'ZF_pgjG6rhfxsI1g17CmHTot4WuP2GZTEgUV2qEN0E8C',
       },
     ],
     'condition': 'checkout_chromeos and checkout_src_internal',