fix(docs): pin pygments to 2.19.2 and keep syntax highlighting (#5854) #3808

Job	Run time
changes	6s
test-dbt-versions (1.4)	1m 39s
test-dbt-versions (1.7)	1m 51s
test-dbt-versions (1.5)	1m 38s
test-dbt-versions (1.9)	1m 42s
test-dbt-versions (1.8)	1m 42s
test-dbt-versions (1.10)	1m 53s
test-dbt-versions (1.3)	1m 51s
test-dbt-versions (1.6)	1m 36s
test-vscode	-1s
test-vscode-e2e	-7s
migration-test	1m 47s
cicd-tests-windows	9m 40s
doc-tests	43s
style-and-cicd-tests (3.12)	25m 51s
style-and-cicd-tests (3.9)	24m 0s
style-and-cicd-tests (3.11)	23m 25s
ui-test	1m 21s
style-and-cicd-tests (3.10)	23m 32s
style-and-cicd-tests (3.13)	22m 26s
engine-tests-docker (trino)	8m 22s
engine-tests-docker (mysql)	1m 49s
engine-tests-docker (postgres)	2m 22s
engine-tests-docker (spark)	5m 27s
engine-tests-docker (starrocks)	2m 43s
engine-tests-docker (clickhouse)	2m 48s
engine-tests-docker (mssql)	1m 59s
engine-tests-docker (duckdb)	1m 52s
engine-tests-docker (risingwave)	2m 46s
ui-style	-1s
engine-tests-cloud (databricks)	12m 27s
engine-tests-cloud (clickhouse-cloud)	16m 57s
engine-tests-cloud (bigquery)	15m 24s
engine-tests-cloud (athena)	21m 37s
engine-tests-cloud (snowflake)	9m 21s
engine-tests-cloud (gcp-postgres)	4m 56s
engine-tests-cloud (fabric)	5m 29s
engine-tests-cloud (redshift)	7m 45s
	4h 30m 38s

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