chore(deps): bump python in /backend

Bumps python from 3.13-slim-trixie to 3.14-slim-trixie.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.14-slim-trixie
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/Dockerfile.lite

@@ -7,7 +7,7 @@
 # -----------------------------------------------------------------------------
 # Stage 1: Build Stage - Install Python dependencies with compilation
 # -----------------------------------------------------------------------------
-FROM python:3.13-slim-trixie AS builder
+FROM python:3.14-slim-trixie AS builder
 
 WORKDIR /build
 
@@ -31,7 +31,7 @@ RUN pip install --user --no-cache-dir --no-warn-script-location -r requirements-
 # -----------------------------------------------------------------------------
 # Stage 2: Runtime Stage - Minimal production image with non-root user
 # -----------------------------------------------------------------------------
-FROM python:3.13-slim-trixie
+FROM python:3.14-slim-trixie
 
 # OCI annotations for container metadata and compliance
 LABEL org.opencontainers.image.title="OpenTranscribe Backend Lite" \

backend/Dockerfile.prod

@@ -12,7 +12,7 @@ FROM denoland/deno:bin AS deno-bin
 # -----------------------------------------------------------------------------
 # Stage 1: Build Stage - Install Python dependencies with compilation
 # -----------------------------------------------------------------------------
-FROM python:3.13-slim-trixie AS builder
+FROM python:3.14-slim-trixie AS builder
 
 WORKDIR /build
 
@@ -46,7 +46,7 @@ RUN pip install --user --no-cache-dir --no-warn-script-location --no-deps whispe
 # -----------------------------------------------------------------------------
 # Stage 2: Runtime Stage - Minimal production image with non-root user
 # -----------------------------------------------------------------------------
-FROM python:3.13-slim-trixie
+FROM python:3.14-slim-trixie
 
 # OCI annotations for container metadata and compliance
 LABEL org.opencontainers.image.title="OpenTranscribe Backend" \