Update ImageSharp reference

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
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• I have provided test coverage for my change (where applicable)

Description

Simple version bump. Fast-tracking this through without review because the package retention policy deleted the previous dependency

[codecov]

Codecov Report

Merging #194 (f8302b9) into master (3468b8c) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #194   +/-   ##
=====================================
  Coverage      70%    70%           
=====================================
  Files          87     87           
  Lines        5116   5116           
  Branches     1062   1062           
=====================================
  Hits         3595   3595           
  Misses       1307   1307           
  Partials      214    214           

Flag	Coverage Δ
unittests	70% <ø> (ø)

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