feat: use uv pip compile for update-constraints (#26)

pip-tools are very slow. What takes it 10+ minutes to resolve all
dependencies can be done in seconds with `uv`. This is especially
problematic when we attempt to run `update-constraints` against a repo
with a huge dependency tree (like instructlab/instructlab) which may
even time out in gate because of how slow pip-compile is.

`uv pip compile` is, largely, a drop-in replacement for `pip-compile`,
so the transition is very simple.

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>











**Checklist:**

- [ ] **Commit Message Formatting**: Commit titles and messages follow guidelines in the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/#summary).
- [ ] [Changelog](https://github.com/instructlab/ci-actions/blob/main/CHANGELOG.md) updated with breaking and/or notable changes for the next minor release.
- [ ] Documentation has been added and/or updated, if applicable.
- [ ] Unit tests have been added and/or updated. (If this is not applicable, please provide a justification.)
- [ ] Integration testing has been performed, if applicable

## Description of this Change




Approved-by: courtneypacheco

Approved-by: ktdreyer

Author: mergify[bot]

actions/update-constraints/generate_constraints.sh

@@ -16,12 +16,11 @@ REQUIREMENTS_FILES=$(grep -v '^#' requirements-files.in | tr '\n' ' ')
 CONSTRAINTS_FILE=constraints-dev.txt
 
 # shellcheck disable=SC2086
-pip-compile -U \
+uv pip compile -U \
     --no-header \
     --annotate \
     --annotation-style line \
     --allow-unsafe \
-    --strip-extras \
     --output-file=$CONSTRAINTS_FILE \
     --constraint constraints-dev.txt.in \
     $REQUIREMENTS_FILES

actions/update-constraints/update-constraints.md

@@ -13,9 +13,9 @@ for InstructLab CI.
 ## Requirements
 
 The project should define a new `constraints` tox target in `tox.ini` file that
-will install a particular version of `pip-tools`. It's advised to pin the
-`pip-tools` version in the `tox` environment definition to avoid any potential
-breakages due to changes in the `pip-compile` tool itself.
+will install a particular version of `uv`. It's advised to pin the
+`uv` version in the `tox` environment definition to avoid any potential
+breakages due to changes in the `uv` tool itself.
 
 Example `tox.ini` entry:
 
@@ -26,7 +26,7 @@ basepython = {[testenv:py3]basepython}
 skip_install = True
 skipsdist = true
 deps =
-    pip-tools==7.4.1
+    uv==0.7.8
 commands = {posargs}
 allowlist_externals = *
 ```