Automatic bump version upon release

[kavitharaju]

The version tag of the release should be visible on the Swagger Docs
For that it is set here in code

Which requires manual changes before each release.
To avoid that some automation could be used.

• Automatic bump version upon release which will make this code change on github actions (https://pypi.org/project/bump2version/)
• Setting this value using ENV variable or some such places which will ensure it points to the latest release number.

[kavitharaju]

Having an API to get the current version will be good too.

[kavitharaju]

This fails when run on version-2 branch of vachan-api repo because its protected and the action bot is not able to push