setDaemon() is deprecated, set the daemon attrib directly instead

[pepoluan]

What do these changes do?

Replace call to .setDaemon() to direct setting of .daemon attribute, as described in the documentation.

Are there changes in behavior for the user?

None.

Related issue number

None.

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist

[codecov[bot]]

Codecov Report

Merging #357 (1b30946) into master (d56f7e9) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #357   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines         1696      1696           
  Branches       310       310           
=========================================
  Hits          1696      1696           

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