Import deps transitively in extension

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7528d67) 87.39% compared to head (9f4cff4) 87.39%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #174 +/- ## ======================================= Coverage 87.39% 87.39% ======================================= Files 11 11 Lines 1182 1182 ======================================= Hits 1033 1033 Misses 149 149 ``` | [Files](https://app.codecov.io/gh/JuliaLinearAlgebra/BlockBandedMatrices.jl/pull/174?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaLinearAlgebra) | Coverage Δ | | |---|---|---| | [ext/BlockBandedMatricesSparseArraysExt.jl](https://app.codecov.io/gh/JuliaLinearAlgebra/BlockBandedMatrices.jl/pull/174?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaLinearAlgebra#diff-ZXh0L0Jsb2NrQmFuZGVkTWF0cmljZXNTcGFyc2VBcnJheXNFeHQuamw=) | `100.00% <ø> (ø)` | |

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