chore(deps): pin dependencies

This MR contains the following updates:

Package	Update	Change
Flask-Session (changelog)	pin	~=0.8 -> ==0.8.0
Flask-session (changelog)	pin	~=0.8 -> ==0.8.0
pymongo	pin	~=4.6 -> ==4.15.5

Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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