tests/integration: fix flake8 failures (E721 do not compare types), and fix Dockerfile for debian "bookworm"

[thaJeztah]

• relates to tests/integration: update some tests for updated error-messages #3165, where I saw these failures.

---

Run flake8 docker/ tests/
  flake8 docker/ tests/
  shell: /usr/bin/bash -e {0}
  env:
    DOCKER_BUILDKIT: 1
    pythonLocation: /opt/hostedtoolcache/Python/3.11.4/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.11.4/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.4/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.4/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.4/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.11.4/x64/lib
tests/integration/api_container_test.py:1395:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
tests/integration/api_container_test.py:1408:24: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
tests/integration/api_image_test.py:35:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
tests/integration/api_image_test.py:46:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
Error: Process completed with exit code 1.

[thaJeztah]

Ah, lol, and more failures due to the base-image having switched to "bookworm";

Dockerfile:8
--------------------
   7 |     ARG APT_MIRROR
   8 | >>> RUN sed -ri "s/(httpredir|deb).debian.org/${APT_MIRROR:-deb.debian.org}/g" /etc/apt/sources.list \
   9 | >>>     && sed -ri "s/(security).debian.org/${APT_MIRROR:-security.debian.org}/g" /etc/apt/sources.list
  10 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c sed -ri \"s/(httpredir|deb).debian.org/${APT_MIRROR:-deb.debian.org}/g\" /etc/apt/sources.list     && sed -ri \"s/(security).debian.org/${APT_MIRROR:-security.debian.org}/g\" /etc/apt/sources.list" did not complete successfully: exit code: 2

[milas]

👍🏻