Bump serde_json from 1.0.100 to 1.0.102 in /cmd/pinniped-proxy (#6454)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.100 to
1.0.102.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/serde-rs/json/releases">serde_json's
releases</a>.</em></p>
<blockquote>
<h2>v1.0.102</h2>
<ul>
<li>Add a way to customize the serialization of byte arrays (<a
href="https://redirect.github.com/serde-rs/json/issues/1039">#1039</a>)</li>
</ul>
<h2>v1.0.101</h2>
<ul>
<li>Allow f32 and f64 as keys in maps (<a
href="https://redirect.github.com/serde-rs/json/issues/1027">#1027</a>,
thanks <a
href="https://github.com/overdrivenpotato"><code>@​overdrivenpotato</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/json/commit/658689d36bc4c4c04b6d40bca4719ee99d09a781"><code>658689d</code></a>
Release 1.0.102</li>
<li><a
href="https://github.com/serde-rs/json/commit/42dbd000163dc8e3aa07fe9dbee3691073c10627"><code>42dbd00</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/json/issues/1039">#1039</a>
from dtolnay/writebytearray</li>
<li><a
href="https://github.com/serde-rs/json/commit/a1ca32a5c759066b3d8a84267078869ce74df773"><code>a1ca32a</code></a>
Factor out byte array serialization to a new Formatter method</li>
<li><a
href="https://github.com/serde-rs/json/commit/857b010ce0dd98ba37e9c7c773b72940b7605008"><code>857b010</code></a>
Inline Serializer::serialize_u8 into serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/6ad54959060c8b87b4f7459e203d4750dcb1fd94"><code>6ad5495</code></a>
Inline u8::serialize into serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/44b4a6c8599d8988c82e3932a7a1cf3a38f377c3"><code>44b4a6c</code></a>
Simplify serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/0e2c949638571990059c9783cf6f06f0d77126b2"><code>0e2c949</code></a>
Inline SerializeSeq::end into serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/1b72f2b34bccd40abef5f283034540b4cb460856"><code>1b72f2b</code></a>
Inline SerializeSeq::serialize_element into serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/55a7f5c35281feb75f27778200f2a8bca01680b3"><code>55a7f5c</code></a>
Inline Serializer::serialize_seq into serialize_bytes</li>
<li><a
href="https://github.com/serde-rs/json/commit/3ddda759cf4c1c9d7b210943aea6f3a58df03a2b"><code>3ddda75</code></a>
Format PR 1037 with rustfmt</li>
<li>Additional commits viewable in <a
href="https://github.com/serde-rs/json/compare/v1.0.100...v1.0.102">compare
view</a></li>
</ul>
</details>
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