build(deps): bump astral-sh/uv from 0.11.20 to 0.11.21 in /docker

Bumps [astral-sh/uv](https://github.com/astral-sh/uv) from 0.11.20 to 0.11.21.
- [Release notes](https://github.com/astral-sh/uv/releases)
- [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md)
- [Commits](astral-sh/uv@0.11.20...0.11.21)

---
updated-dependencies:
- dependency-name: astral-sh/uv
  dependency-version: 0.11.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docker/Dockerfile

@@ -6,7 +6,7 @@
 ##
 # gdal:ubuntu-small no longer comes with netcdf support compiled into gdal
 # syntax=docker/dockerfile:1
-FROM ghcr.io/astral-sh/uv:0.11.20@sha256:eaa5f1a3305307aaf9e67fe2bbba1d85ebbb2d8a63bce23af21797bfafbe0f8b AS uv
+FROM ghcr.io/astral-sh/uv:0.11.21@sha256:ff07b86af50d4d9391d9daf4ff89ce427bc544f9aae87057e69a1cc0aa369946 AS uv
 
 FROM ghcr.io/osgeo/gdal:ubuntu-full-3.13.1@sha256:aff1d5515aa0e9b50be34ab11d6c0c2cfabc23cdcb7a2e0bc5748101eedb3e4a AS base