Update cheatsheets

tldr/pip-lock

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pip lock
+
+> Lock Python packages and their dependencies into a reproducible file.
+> Experimental feature of `pip`.
+> More information: <https://pip.pypa.io/en/stable/cli/pip_lock/>.
+
+- Generate a `pylock.toml` for the current project:
+
+`pip lock {{[-e|--editable]}} .`
+
+- Lock dependencies from a requirements file:
+
+`pip lock {{[-r|--requirement]}} {{path/to/requirements.txt}}`
+
+- Specify a custom output file for the lock:
+
+`pip lock {{[-o|--output]}} {{path/to/lockfile.toml}}`
+
+- Lock a specific package and its dependencies:
+
+`pip lock {{package}}`