Relax redis-py upper bound to <8.0 (#528)

## Summary
- relax `redis` dependency upper bound from `<7.2` to `<8.0`
- update `uv.lock` to match the new constraint

Closes #527

## Validation
- ran `uv lock`
- ran `uv run pytest` (local environment has existing unrelated
integration/import failures)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk dependency constraint change; main risk is incompatibility
with `redis` 7.x API/behavior if consumers upgrade without corresponding
test coverage.
> 
> **Overview**
> **Relaxes dependency constraints** by widening the `redis` requirement
from `<7.2` to `<8.0` in `pyproject.toml`.
> 
> **Lockfile updated** (`uv.lock`) to reflect the new `redis` version
range.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
ceaa178. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: abrookins

pyproject.toml

@@ -26,7 +26,7 @@ classifiers = [
 dependencies = [
     "numpy>=1.26.0,<3",
     "pyyaml>=5.4,<7.0",
-    "redis>=5.0,<7.2",
+    "redis>=5.0,<8.0",
     "pydantic>=2,<3",
     "tenacity>=8.2.2",
     "ml-dtypes>=0.4.0,<1.0.0",
@@ -148,4 +148,3 @@ filterwarnings = [
 warn_unused_configs = true
 ignore_missing_imports = true
 exclude = ["env", "venv", ".venv"]
-