Bump fastapi to >=0.136.3 to fix PYSEC-2026-161 #4030

Job	Run time
changes	8s
test-dbt-versions (1.5)	1m 34s
test-dbt-versions (1.4)	1m 41s
test-dbt-versions (1.3)	1m 38s
test-dbt-versions (1.6)	20s
test-dbt-versions (1.10)	1m 50s
test-dbt-versions (1.7)	1m 44s
test-dbt-versions (1.9)	1m 34s
test-dbt-versions (1.8)	1m 41s
test-vscode	0s
test-vscode-e2e	0s
doc-tests	41s
cicd-tests-windows	10m 19s
migration-test	1m 36s
style-and-cicd-tests (3.9)	1m 32s
style-and-cicd-tests (3.11)	6h 0m 17s
style-and-cicd-tests (3.12)	6h 0m 15s
style-and-cicd-tests (3.10)	6h 0m 15s
style-and-cicd-tests (3.13)	24m 4s
engine-tests-docker (mssql)	2m 28s
engine-tests-docker (trino)	8m 46s
engine-tests-docker (spark)	5m 5s
engine-tests-docker (postgres)	2m 21s
engine-tests-docker (starrocks)	3m 0s
engine-tests-docker (clickhouse)	2m 58s
engine-tests-docker (mysql)	1m 52s
engine-tests-docker (risingwave)	2m 47s
engine-tests-docker (duckdb)	1m 45s
ui-style	0s
ui-test	-1s
engine-tests-cloud	0s
	19h 22m 10s

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