chore: update dev.txt

[keetonian]

Description of changes:
Updates pyyaml to a newer version.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[brettstack]

Approved assuming tests pass

[codecov-io]

Codecov Report

Merging #780 into develop will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #780      +/-   ##
===========================================
+ Coverage    94.71%   94.79%   +0.07%     
===========================================
  Files           67       67              
  Lines         2950     3762     +812     
  Branches       578      829     +251     
===========================================
+ Hits          2794     3566     +772     
- Misses          78      100      +22     
- Partials        78       96      +18

Impacted Files	Coverage Δ
samtranslator/model/dynamodb.py	75% <0%> (-10.72%)	⬇️
samtranslator/model/s3.py	77.77% <0%> (-7.94%)	⬇️
samtranslator/model/iot.py	77.77% <0%> (-7.94%)	⬇️
samtranslator/model/lambda_.py	85.36% <0%> (-3.1%)	⬇️
samtranslator/model/sam_resources.py	95.64% <0%> (-1.33%)	⬇️
samtranslator/model/iam.py	80% <0%> (-1.25%)	⬇️
samtranslator/model/eventsources/push.py	89.12% <0%> (-1.18%)	⬇️
samtranslator/parser/parser.py	86.36% <0%> (-0.31%)	⬇️
...lator/plugins/application/serverless_app_plugin.py	80% <0%> (-0.16%)	⬇️
...amtranslator/policy_template_processor/template.py	100% <0%> (ø)	⬆️
... and 25 more

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