chore(deps): update dependency ruff to v0.15.21

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.15-alpine
+FROM python:3.14-alpine
 ENV PYTHONUNBUFFERED=1
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /usr/local/bin/
 WORKDIR /app

pyproject.toml

@@ -3,14 +3,14 @@ name = "gaehsnitz"
 version = "0.1.0"
 requires-python = ">=3.14"
 dependencies = [
-    "django==6.1.1",
+    "django==6.0.6",
-    "gunicorn==26.2.0",
+    "gunicorn==26.0.0",
-    "psycopg[binary]==3.3.6",
+    "psycopg[binary]==3.3.4",
 ]
 
 [dependency-groups]
 dev = [
-    "ruff==0.16.10",
+    "ruff==0.15.21",
 ]
 
 [tool.ruff]