Prep v2.8.1

[mrueg]

Targetting the right branch this time.

What this PR does / why we need it:

Prepares a bugfix release for v2.8

v2.8.1 / 2023-02-22

• [BUGFIX] Don't crash on non-existent paths @rexagod Don't crash on non-existent path values #1998
• [BUGFIX] Fix public Builder compatibility with BuilderInterface @clamoriniere fix: public Builder compatibility with the BuilderInterface #1994

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
None
Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[rexagod]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrueg, rexagod

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