[master] Prepare 4.5.8

[phil-davis]

Forward-port the changelog and version bump from 4.5 branch to master, so that the changelog etc. in master stays up-to-date.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.77%. Comparing base (49d53f1) to head (2ce84f7).
⚠️ Report is 26 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #752   +/-   ##
=========================================
  Coverage     98.76%   98.77%           
- Complexity     1882     1884    +2     
=========================================
  Files            71       71           
  Lines          5281     5289    +8     
=========================================
+ Hits           5216     5224    +8     
  Misses           65       65           

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