Bump pyyaml from 5.3.1 to 5.4 in /taiyangxue/showdata

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.3.1...5.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: taiyangxue/showdata/requirements.txt

@@ -10,7 +10,7 @@ numpy==1.19.1
 pandas==1.1.1
 python-dateutil==2.8.1
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.4
 requests==2.24.0
 six==1.15.0
 ua-parser==0.10.0