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<a href="https://github.com/gnosis/dex-services/commit/<a class=hub.com/gnosis/dex-services/commit/1aae21680f224e53ed62eb58186f386e40485a17">1aae21680<a href="https://github.com/gnosis/dex-services/commit/1aae21680f224e53ed62eb58186f386e40485a17">&quot;&gt;Update transitive dependencies and correctly pin Rust version for docker (#1652)

Fixes #1650 

This PR just updates transitive dependencies and pins Rust versions to the tested ones when building docker images.

### Test Plan

Once merged, we should see price estimator successfully deploy.

Some manual local testing:
```
$ docker build . -f price-estimator/docker/Dockerfile
...
STEP 10: COMMIT
--&gt; 6d34379bd93
</a><a class="double-link" href="https://github.com/gnosis/dex-services/commit/<a class="double-link" href="https://github.com/gnosis/dex-services/commit/6d34379bd93510912048427a3c2f8aaff53cc77f">6d34379bd</a>">6d34379bd</a><a href="https://github.com/gnosis/dex-services/commit/1aae21680f224e53ed62eb58186f386e40485a17">748651d3e8b751757df1b63e
```

And that the rustup installation script accepts the parameter:
```
$ curl --proto &#39;=https&#39; --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain 1.49.0
...
$ rustc --version
rustc 1.49.0 (e1884a8e3 2020-12-29)
```

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