housekeeping: Upgraded Xamarin.Forms to v4.8

[RLittlesII]

What kind of change does this PR introduce?

Upgrades the Xamarin dependency to 4.8.*

What is the current behavior?

Xamarin dependency is 4.7.*

What is the new behavior?

Xamarin dependency is 4.8.*

What might this PR break?

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #2640 (6c015a2) into main (c57f997) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2640   +/-   ##
=======================================
  Coverage   62.96%   62.96%           
=======================================
  Files         132      132           
  Lines        4733     4733           
=======================================
  Hits         2980     2980           
  Misses       1753     1753           

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[github-actions]

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