Fix loading yaml

[Borda]

What does this PR do?

Fix loading YAML, resolves temporary ban version #5609
follows suggestions from yaml/pyyaml#482 (comment)

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[codecov]

Codecov Report

Merging #5619 (62f93a3) into release/1.2-dev (dfbb592) will decrease coverage by 0%.
The diff coverage is 93%.

@@               Coverage Diff                @@
##           release/1.2-dev   #5619    +/-   ##
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- Coverage               93%     92%    -0%     
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  Files                  146     153     +7     
  Lines                10315   10840   +525     
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+ Hits                  9549   10017   +468     
- Misses                 766     823    +57