Bump to Scala 2.13.10 (backport #2774) (#2775)

* Bump to Scala 2.13.10 (#2774)

2.13.9 has a binary compatibility regression so should be avoided.

(cherry picked from commit c53265d6

)

# Conflicts:
#	.github/workflows/test.yml

* Fix backport conflicts

* Fix scalaVersion in README

* Waive binary compatibility check for plugin for 2.13.10

3.5.4 is published for 2.13.10 so we cannot check binary compatibility
for it.

Co-authored-by: Jack Koenig <koenig@sifive.com>