Widen dependencies instead of bumping them

The `pytest` and `sybil` dependencies can be purely widen, supporting
the same oldest versions as before, as we are not affected by the
breaking changes.

This allows us to keep backwards compatibility for downstream project.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

pyproject.toml

@@ -63,8 +63,8 @@ lib = []
 model = []
 extra-lint-examples = [
   "pylint >= 2.17.3, < 4",
-  "pytest >= 7.4.2, < 9",
-  "sybil >= 6.0.3, < 7",
+  "pytest >= 7.3.0, < 9",
+  "sybil >= 5.0.3, < 7",
 ]
 dev-flake8 = [
   "flake8 == 6.1.0",