chore(deps): pin dependency setuptools to v==60.5.0 (googleapis#1183)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [setuptools](https://togithub.com/pypa/setuptools) | pin | `<=60.5.0` -> `==60.5.0` |

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requirements.txt

@@ -7,4 +7,4 @@ protobuf==3.19.4
 pypandoc==1.7.2
 PyYAML==6.0
 dataclasses==0.6  # TODO(busunkim) remove when 3.6 support is dropped
-setuptools<=60.5.0 # pin setuptools to workaround https://github.com/pypa/setuptools/issues/3072
+setuptools==60.5.0 # pin setuptools to workaround https://github.com/pypa/setuptools/issues/3072