Release metadata for 1.13.4

[jhunkeler]

Resolves JP-nnnn

Closes #

This PR addresses ...

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (726f4ce) 75.19% compared to head (2b4842e) 75.19%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8271   +/-   ##
=======================================
  Coverage   75.19%   75.19%           
=======================================
  Files         470      470           
  Lines       38580    38580           
=======================================
  Hits        29012    29012           
  Misses       9568     9568           

Flag	Coverage Δ		*Carryforward flag
nightly	77.38% <ø> (ø)		Carriedforward from b2b6adf

*This pull request uses carry forward flags. Click here to find out more.

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[hbushouse]

Looks good. Just one suggested change.

[hbushouse]

Looks good.