CI: fix sccache timeout (#9095) #6616

Job	Run time
C++ API (coverage)	1m 7s
Rust/C++ FFI tests (asan)	2m 7s
Rust tests (tsan)	6m 33s
Rust tests (asan)	6m 59s
Rust tests (miri)	1m 34s
Rust/C++ FFI tests (tsan)	1m 58s
DuckDB libraries available in R2	2s
Mirror DuckDB to R2	-1s
Rust tests (coverage) (${{ matrix.suite }})	-1s
	20m 18s

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