Update pre-commit requirement and fix it's branch name

[Ashesh3]

Currently running the pre-commit throws the below error:

[INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Restored changes from /root/.cache/pre-commit/patch1653563922.
An unexpected error has occurred: CalledProcessError: command: ('/usr/lib/git-core/git', 'checkout', 'master')
return code: 1
expected return code: 0
stdout: (none)
stderr:
    error: pathspec 'master' did not match any file(s) known to git
    
Check the log at /root/.cache/pre-commit/pre-commit.log

This seems to be because in .pre-commit-config , the branch master is being used as the revision for https://github.com/pre-commit/pre-commit-hooks . Which does not exist (at least anymore).

This change fixes the branch name to main.

It also updates pre-commit PIP requirement to version 2.19.0 which is needed to support black hook.

INFO] Initializing environment for https://github.com/asottile/seed-isort-config.
[INFO] Initializing environment for https://github.com/pre-commit/mirrors-isort.
[INFO] Initializing environment for https://github.com/ambv/black.
[ERROR] The hook `black` requires pre-commit version 2.9.2 but version 2.2.0 is installed.  Perhaps run `pip install --upgrade pre-commit`.

[vigneshhari]

LSTM, Untested.