fix: Use SQLAlchemy in-built timestamp function

[prateekj117]

Fixes #5943

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

Short description of what this resolves:

Pytz function used to save same timestamp in Database in case of subsequent requests.

Changes proposed in this pull request:

Use Inbuild SqlAlchemy Function for saving Timestamp

[codecov]

Codecov Report

Merging #5948 into development will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #5948      +/-   ##
===============================================
+ Coverage        66.43%   66.44%   +<.01%     
===============================================
  Files              285      285              
  Lines            13869    13871       +2     
===============================================
+ Hits              9214     9216       +2     
  Misses            4655     4655

Impacted Files	Coverage Δ
app/models/user.py	56.27% <100%> (+0.17%)	⬆️
app/models/session.py	90.1% <100%> (+0.1%)	⬆️

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[iamareebjamal]

Suggested change

	from sqlalchemy.sql import func as dateandtime
	from sqlalchemy.sql import func as sql_func

[iamareebjamal]

It isn't anywhere else?

[prateekj117]

@iamareebjamal Yes.