chore: update pr template with guidance for upgrading deps

[kaizencc]

An action item following a major version upgrade where we did not properly check for breaking changes.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.76%. Comparing base (5d9ebe0) to head (8c662c4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1164   +/-   ##
=======================================
  Coverage   87.76%   87.76%           
=======================================
  Files          72       72           
  Lines       10135    10135           
  Branches     1338     1338           
=======================================
  Hits         8895     8895           
  Misses       1215     1215           
  Partials       25       25           

Flag	Coverage Δ
suite.unit	87.76% <ø> (ø)

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