chore(deps): Bump postgres-protocol from 0.6.6 to 0.6.7 (#1426)

Bumps [postgres-protocol](https://github.com/sfackler/rust-postgres)
from 0.6.6 to 0.6.7.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/c3580774fcdc4597dac81e1128ef8bef1e6ff3a7"><code>c358077</code></a>
Release postgres-protocol v0.6.7</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/4b9cdca708ca515a2da13e181a6ddc05e5590e67"><code>4b9cdca</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-postgres/issues/1162">#1162</a>
from sfackler/transaction-builder-cancellation</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/a0b2d701ebee8fd5c5b3d6ee5cf0cde5d7f36a65"><code>a0b2d70</code></a>
Fix cancellation of TransactionBuilder::start</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/a1bdd0bf15325cdc05fcfe3c0671953b2a8c7981"><code>a1bdd0b</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-postgres/issues/1160">#1160</a>
from sfackler/query-typed-cleanup</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/71c836b980799256a7f266195382fc8449fca5e4"><code>71c836b</code></a>
query_typed tweaks</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/257bcfd283479de024330bc6e8919d61da5e2b98"><code>257bcfd</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-postgres/issues/1147">#1147</a>
from exograph/exograph</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/0fa32471ef2e20b7f2e554d6d97cde3a67f1d494"><code>0fa3247</code></a>
Fix a clippy warning</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/dbd4d02e2f3a367b949e356e9dda40c08272d954"><code>dbd4d02</code></a>
Address review comment to rename query_with_param_types to
query_typed</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/647a9256b80ef961b8065678f41745ca040202b5"><code>647a925</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-postgres/issues/1144">#1144</a>
from rigby-dane/add_row_description</li>
<li><a
href="https://github.com/sfackler/rust-postgres/commit/2647024c660ca27701898325a8772b83bece4982"><code>2647024</code></a>
PR Fix: Clone first then move</li>
<li>Additional commits viewable in <a
href="https://github.com/sfackler/rust-postgres/compare/postgres-protocol-v0.6.6...postgres-protocol-v0.6.7">compare
view</a></li>
</ul>
</details>
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