use higher rank associated types instead of gats

[codecov[bot]]

Codecov Report

Attention: 264 lines in your changes are missing coverage. Please review.

Comparison is base (ed9f95a) 91.48% compared to head (36fe42a) 91.42%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #76 +/- ## ========================================== - Coverage 91.48% 91.42% -0.06% ========================================== Files 56 56 Lines 61952 62000 +48 ========================================== + Hits 56674 56681 +7 - Misses 5278 5319 +41 ``` | [Files](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | Coverage Δ | | |---|---|---| | [faer-cholesky/src/ldlt\_diagonal/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jaG9sZXNreS9zcmMvbGRsdF9kaWFnb25hbC9jb21wdXRlLnJz) | `92.62% <100.00%> (+0.02%)` | :arrow_up: | | [faer-cholesky/src/ldlt\_diagonal/update.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jaG9sZXNreS9zcmMvbGRsdF9kaWFnb25hbC91cGRhdGUucnM=) | `90.14% <ø> (ø)` | | | [faer-cholesky/src/llt/update.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jaG9sZXNreS9zcmMvbGx0L3VwZGF0ZS5ycw==) | `87.95% <ø> (ø)` | | | [faer-core/src/householder.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy9ob3VzZWhvbGRlci5ycw==) | `89.65% <100.00%> (ø)` | | | [faer-core/src/zip.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy96aXAucnM=) | `95.62% <ø> (ø)` | | | [faer-evd/src/hessenberg.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1ldmQvc3JjL2hlc3NlbmJlcmcucnM=) | `99.82% <100.00%> (+<0.01%)` | :arrow_up: | | [faer-evd/src/tridiag.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1ldmQvc3JjL3RyaWRpYWcucnM=) | `99.27% <100.00%> (+<0.01%)` | :arrow_up: | | [faer-lu/src/full\_pivoting/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1sdS9zcmMvZnVsbF9waXZvdGluZy9jb21wdXRlLnJz) | `95.77% <100.00%> (-0.02%)` | :arrow_down: | | [faer-lu/src/partial\_pivoting/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1sdS9zcmMvcGFydGlhbF9waXZvdGluZy9jb21wdXRlLnJz) | `98.85% <100.00%> (+<0.01%)` | :arrow_up: | | [faer-qr/src/col\_pivoting/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1xci9zcmMvY29sX3Bpdm90aW5nL2NvbXB1dGUucnM=) | `93.98% <100.00%> (ø)` | | | ... and [6 more](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/76/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah)

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.