Update dependency pydantic to ~=2.8.0 (pixee#686)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pyproject.toml

@@ -15,7 +15,7 @@ dependencies = [
     "isort>=5.12,<5.14",
     "libcst>=1.1,<1.5",
     "packaging>=23.2,<25.0",
-    "pydantic~=2.7.0",
+    "pydantic~=2.8.0",
     "pylint>=3.2,<3.3",
     "python-json-logger~=2.0.0",
     "PyYAML~=6.0.0",