Add Release 0.20.1 to changelog #14681

Job	Run time
cpp-paths-filter	4s
docs-paths-filter	2s
python-paths-filter	6s
rust-paths-filter	5s
web-paths-filter	5s
Checks / Lint markdown	14s
Checks / markdown-paths-filter	3s
Checks / Misc formatting	20s
Checks / Rerun lints	27s
Checks / Check if running codegen would produce any changes	56s
Checks / Spell Check	8s
Update PR Body / Update PR body	22s
Deploy Landing Preview	0s
C++ tests	0s
Build web viewer	0s
Build rerun_js	0s
Upload Web	0s
Save PR Summary	0s
Rust Checks	0s
Checks / Check links	22s
Minimum CLI Build	0s
Python Checks	0s
Minimum Wheel Build	0s
Minimum Wheel Test	0s
	3m 14s

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