Bump tensorflow from 2.5.3 to 2.6.4 in /lib/galaxy/dependencies

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.5.3 to 2.6.4.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v2.5.3...v2.6.4)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
...

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lib/galaxy/dependencies/conditional-requirements.txt

@@ -46,7 +46,7 @@ pygithub
 influxdb
 
 # Deep learning packages for tool recommendation
-tensorflow==2.5.3
+tensorflow==2.6.4
 
 # weasyprint has problematic requirements so make it optional (i.e. cairo)
 # xref https://github.com/galaxyproject/galaxy/pull/9651