python3-testtools: upgrade 2.7.1 -> 2.7.2

python3-testtools: upgrade 2.7.1 -> 2.7.2

Also add python3-json and python3-compression to RDEPENDS so that the
module imports correctly.

Changelog (https://github.com/testing-cabal/testtools/blob/master/NEWS):

- Treat methodName="runTest" similar to unittest.TestCase,
  fixes compatibility with pytest 8.3. (Natanael Copa, #372)
- Format with ``ruff format``. (Jelmer Vernooij)
- Use ruff for linting. (Jelmer Vernooij)
- Fix compatibility with Python 3.12.1. (Matthew Treinish)
- Deprecate SkippedTest exception. (Stephen Finucane)
- Drop support for Python 3.7. (Jelmer Vernooij)

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>