[GuideLLM Refactor] Add tox command to update lock file (#415)

## Summary

<!--
Include a short paragraph of the changes introduced in this PR.
If this PR requires additional context or rationale, explain why
the changes are necessary.
-->
Adds a `tox` env for updating the lock file. Also allows args for mypy
env.


---

- [x] "I certify that all code in this PR is my own, except as noted
below."

## Use of AI

- [ ] Includes AI-assisted code completion
- [ ] Includes code generated by an AI application
- [ ] Includes AI-generated tests (NOTE: AI written tests should have a
docstring that includes `## WRITTEN BY AI ##`)

Author: sjmonson

tox.ini

@@ -58,7 +58,7 @@ description = Run type checks
 deps =
     .[dev]
 commands =
-    mypy --check-untyped-defs
+    mypy --check-untyped-defs {posargs}
 
 
 [testenv:links]
@@ -98,3 +98,13 @@ commands =
     rm -rf .tox
     rm -rf .ruff_cache
     rm -rf .coverage
+
+
+[testenv:lock]
+description = Update pylock
+skip_install = true
+setenv =
+    PDM_IGNORE_SAVED_PYTHON="1"
+deps = pdm[all]
+commands =
+    pdm lock --update-reuse