Bump @grpc/grpc-js from 1.9.14 to 1.9.15 in /static (#4333)

Bumps [@grpc/grpc-js](https://github.com/grpc/grpc-node) from 1.9.14 to
1.9.15.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/grpc/grpc-node/releases"><code>@​grpc/grpc-js</code>'s
releases</a>.</em></p>
<blockquote>
<h2><code>@​grpc/grpc-js</code> 1.9.15</h2>
<ul>
<li>Avoid buffering significantly more than
<code>grpc.max_receive_message_size</code> per received message.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/grpc/grpc-node/commit/08b0422dae56467ecae1007e899efe66a8c4a650"><code>08b0422</code></a>
Merge pull request from GHSA-7v5v-9h63-cj86</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/c75e04894829ff5c0eac83a3eea96724ec7cd118"><code>c75e048</code></a>
grpc-js: Bump to 1.9.15</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/d5d62b4d94acf05d4335122efa9e36b07955eb2d"><code>d5d62b4</code></a>
grpc-js: Avoid buffering significantly more than
max_receive_message_size per...</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/02d034489a923f7f9cb15d4720cc2c865b11ef12"><code>02d0344</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2741">#2741</a>
from sergiitk/backport-1.9-psm-interop-common-prod-t...</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/cf14020643472af7ec56c3591c73f91d74c4aa73"><code>cf14020</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2729">#2729</a>
from sergiitk/psm-interop-common-prod-tests</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/da44229934a18519126f6993b6feed00c60ded0a"><code>da44229</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2738">#2738</a>
from murgatroid99/backport-1.9-grpc-js_linkify-it_fix</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/5ae7c8c84518fa49ec639cd36051d65e50db5a6c"><code>5ae7c8c</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2735">#2735</a>
from murgatroid99/grpc-js_linkify-it_fix</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/eed21ba0bba8e8b1d8bc01001cfd0faf61bb9a75"><code>eed21ba</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2714">#2714</a>
from sergiitk/backport-1.9-psm-interop-pkg-dev</li>
<li><a
href="https://github.com/grpc/grpc-node/commit/63763a40003b17e5e8f3f9c8d7f4aeb6592569f6"><code>63763a4</code></a>
Merge pull request <a
href="https://redirect.github.com/grpc/grpc-node/issues/2712">#2712</a>
from sergiitk/psm-interop-pkg-dev</li>
<li>See full diff in <a
href="https://github.com/grpc/grpc-node/compare/@grpc/[email protected]...@grpc/[email protected]">compare
view</a></li>
</ul>
</details>
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