Update to Mozilla Android Components 48.0.5.

For mozilla-mobile#11875 - Prevent mixup of region / locale based sea…

…rch engines

We have two search engine types:
- one based on MLS reported region,
- one based only on Locale.

There are multiple steps involved in returning the default search engine for
example and though at each step we could verify if a certain operation is
completed we are still exposed to concurrency issues.
Simplest and most effective way to make sure the MLS engines do not mix with
Locale based engines is to use the same type of engines for the entire duration
of the app. At the next cold start we'll verify again which engines to use.

Using the Locale based engines (fallbacks) is expected to only happen once, at
the first run of the application after being installed.

Use Mozilla Android Components 48.0.3.

Update to Mozilla Android Components 48.0.2.

For mozilla-mobile#12081 - Properly installs searchengines when MLS c…

…ompletes (mozilla-mobile#12141)

Revert "For mozilla-mobile#9946: Update FennecBeta branding (mozilla-…

…mobile#10066)" to push to Firefox Beta (mozilla-mobile#11872)

* Revert "For mozilla-mobile#9946: Update FennecBeta branding (mozilla-mobile#10066)" to push to Firefox Beta.

This reverts commit 95f26f1.

* No issue: Test remove codecov (mozilla-mobile#11928)

Co-authored-by: Emily Kager <emilykager@gmail.com>

Update Mozilla Android Components to 48.0.0.

For issue mozilla-mobile#11835 - Update text fonts

Updated the fonts and colors for several texts throughout the application.

For mozilla-mobile#11392: Rename Installation ping to FirstSession (m…

…ozilla-mobile#11964)

Issue mozilla-mobile#11378 - Pin AC version to 46.0.0