Python 3.11 upgrade

[dmichaels-harvard]

Bump required PyYAML version to ^6.0.1 to resolve a Mac M1 issue with downstream builds.

As @netsettler notes in discussion on utils PR #277, the PyYAML Change Log says this about major version 6:

6.0 (2021-10-13)

* https://github.com/yaml/pyyaml/pull/327 -- Change README format to Markdown
* https://github.com/yaml/pyyaml/pull/483 -- Add a test for YAML 1.1 types
* https://github.com/yaml/pyyaml/pull/497 -- fix float resolver to ignore `.` and `._`
* https://github.com/yaml/pyyaml/pull/550 -- drop Python 2.7
* https://github.com/yaml/pyyaml/pull/553 -- Fix spelling of “hexadecimal”
* https://github.com/yaml/pyyaml/pull/556 -- fix representation of Enum subclasses
* https://github.com/yaml/pyyaml/pull/557 -- fix libyaml extension compiler warnings
* https://github.com/yaml/pyyaml/pull/560 -- fix ResourceWarning on leaked file descriptors
* https://github.com/yaml/pyyaml/pull/561 -- always require `Loader` arg to `yaml.load()`
* https://github.com/yaml/pyyaml/pull/564 -- remove remaining direct distutils usage

Based on this, he reasons:

It looks like really dropping Python 2 is the major incompatible change, though the "always require Loader arg to yaml.load()" might require some research to make sure we weren't breaking something.

[coveralls]

Pull Request Test Coverage Report for Build 6421775176

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.009%) to 77.65%

---

Files with Coverage Reduction	New Missed Lines	%
dcicutils/s3_utils.py	1	87.41%
<!--	Total:	1		-->

Totals
Change from base Build 6354871296:	-0.009%
Covered Lines:	8477
Relevant Lines:	10917

---

💛 - Coveralls