fix(ci): pin fastjsonschema below 2.22 on Python 3.9

fastjsonschema 2.22+ requires Python 3.10+ (PEP 604 type hints), and
2.22.0 still installs on 3.9 and breaks dbt-bigquery imports via nbformat.

Signed-off-by: stuffbyyuki <kake.19940627@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: StuffbyYuki

pyproject.toml

@@ -65,6 +65,10 @@ dev = [
     # it depends on the 'InvalidCatalogIntegrationConfigError' class that only exists as of dbt-adapters==1.16.6
     # so we exclude it to prevent failures and hope that upstream releases a new version with the correct constraint
     "dbt-snowflake!=1.10.1",
+    # fastjsonschema 2.22+ uses PEP 604 type hints and now requires Python >=3.10
+    # (upstream #211 / #213). Keep 3.9 on the 2.21 line; pulled in via
+    # dbt-bigquery → nbformat.
+    "fastjsonschema<2.22; python_version<'3.10'",
     "dbt-athena-community",
     "dbt-clickhouse",
     "dbt-databricks",