try to fix pypy3

Author: cdent

.github/workflows/tests.yaml

@@ -21,7 +21,7 @@ jobs:
                   toxenv: py312
                 - python: "3.13"
                   toxenv: py313
-                - python: pypy-3.8
+                - python: pypy-3.10
                   toxenv: pypy3
                 - python: 3.9
                   toxenv: py39-pytest

README.rst

@@ -20,7 +20,7 @@ looks like this::
 See the docs_ for more details on the many features and formats for
 setting request headers and bodies and evaluating responses.
 
-Gabbi is tested with Python 3.9, 3.10, 3.11, 3.12, 3.13 and pypy3.
+Gabbi is tested with Python 3.9, 3.10, 3.11, 3.12, 3.13 and pypy3.10.
 
 Tests can be run using `unittest`_ style test runners, `pytest`_
 or from the command line with a `gabbi-run`_ script.