Allow variables inheritance in block #761

Job	Run time
Docs (rinja)	22s
Docs (rinja_actix)	35s
Audit	18s
Check order in Cargo.toml	8s
Docs (rinja_axum)	32s
Book	4s
Docs (rinja_derive)	18s
Docs (rinja_parser)	14s
DevSkim	30s
Docs (rinja_rocket)	41s
Package (rinja)	30s
Docs (rinja_warp)	32s
Rustfmt	18s
Test (ubuntu-latest, stable)	1m 13s
Package (rinja_actix)	1m 12s
Test (ubuntu-latest, beta)	55s
Package (rinja_axum)	27s
Cluster-Fuzz	12m 35s
Test (macos-latest, stable)	58s
Package (rinja_derive)	19s
Package (rinja_derive_standalone)	42s
Test (windows-latest, stable)	3m 18s
Package (rinja_parser)	28s
Fuzz (all)	2m 54s
Package (rinja_rocket)	1m 14s
Fuzz (filters)	2m 49s
Package (rinja_warp)	50s
MSRV	20s
Fuzz (html)	2m 51s
Package (testing)	1m 21s
Fuzz (parser)	3m 1s
Package (examples/actix-web-app)	56s
Typos	4s
Package (fuzzing)	35s
	44m 4s

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