Fixes Actor Reminder Incorrect Period

[berndverst]

Description

• The serialization of actor reminders incorrectly used the due time value for the period field. This is now fixed.
• Also bumping the library's protobuf version to be in line with dev requirement.

Issue reference

Fixes #268
Fixes #271

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

Merging #272 (f56d942) into master (04d8389) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #272   +/-   ##
=======================================
  Coverage   89.28%   89.28%           
=======================================
  Files          52       52           
  Lines        2155     2155           
=======================================
  Hits         1924     1924           
  Misses        231      231           

Impacted Files	Coverage Δ
dapr/actor/runtime/_reminder_data.py	100.00% <ø> (ø)

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