ci: Bump sphinx dependency (feast-dev#3441)

* Remove Sphinx dependencies

Signed-off-by: Felix Wang <[email protected]>

* Update requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Update requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Update requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Add py dependency

Signed-off-by: Felix Wang <[email protected]>

* Update 3.8 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Update 3.9 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Update 3.10 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Add back Sphinx

Signed-off-by: Felix Wang <[email protected]>

* Fix 3.8 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Fix 3.9 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

* Fix 3.10 requirements.txt

Signed-off-by: Felix Wang <[email protected]>

Signed-off-by: Felix Wang <[email protected]>

Author: felixwang9817