Update the `incrementalmerkletree` and `bridgetree` patch versions.

[nuttycom]

This also removes the bridgetree transitive dependency when building using the test-dependencies feature flag, as the only use of it can be satisfied just with incrementalmerkletree.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.47 :warning:

Comparison is base (3619b86) 83.42% compared to head (e219ef5) 82.96%.

:exclamation: Current head e219ef5 differs from pull request most recent head 99d56dc. Consider uploading reports for the commit 99d56dc to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #395 +/- ## ========================================== - Coverage 83.42% 82.96% -0.47% ========================================== Files 32 32 Lines 2691 2635 -56 ========================================== - Hits 2245 2186 -59 - Misses 446 449 +3 ``` | [Impacted Files](https://app.codecov.io/gh/zcash/orchard/pull/395?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zcash) | Coverage Δ | | |---|---|---| | [src/builder.rs](https://app.codecov.io/gh/zcash/orchard/pull/395?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zcash#diff-c3JjL2J1aWxkZXIucnM=) | `60.51% <ø> (-1.63%)` | :arrow_down: | | [src/tree.rs](https://app.codecov.io/gh/zcash/orchard/pull/395?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zcash#diff-c3JjL3RyZWUucnM=) | `72.46% <0.00%> (-3.30%)` | :arrow_down: | ... and [7 files with indirect coverage changes](https://app.codecov.io/gh/zcash/orchard/pull/395/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zcash)

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