fix: adding requirements

[asthamohta]

Adding requirements.in and .txt with hashes

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/

[IlyaFaer]

@asthamohta, so, it looks like keyring package requires jeepney, and it's version is not particular.

ERROR: In --require-hashes mode, all requirements must have their versions pinned with ==. These do not:
jeepney>=0.4.2 from https://files.pythonhosted.org/packages/ae/72/2a1e2290f1ab1e06f71f3d0f1646c9e4634e70e1d37491535e19266e8dc9/jeepney-0.8.0-py3-none-any.whl#sha256=c0a454ad016ca575060802ee4d590dd912e35c122fa04e70306de3d076cce755 (from keyring==23.9.3->-r .kokoro/requirements.txt (line 280))

I suppose we can simply add the jeepney package into requirements to explicitly set its version.