Upgrade: [dependabot] - bump @middy/http-header-normalizer from 5.5.0 to 5.5.1 (#1379)

Bumps
[@middy/http-header-normalizer](https://github.com/middyjs/middy/tree/HEAD/packages/http-header-normalizer)
from 5.5.0 to 5.5.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/middyjs/middy/releases"><code>@​middy/http-header-normalizer</code>'s
releases</a>.</em></p>
<blockquote>
<h2>5.5.1</h2>
<h2>What's Changed</h2>
<ul>
<li>:label: ensures that handler return is properly typed by <a
href="https://github.com/canassa"><code>@​canassa</code></a> @ jerizm in
<a
href="https://redirect.github.com/middyjs/middy/pull/1244">middyjs/middy#1244</a>
<a
href="https://redirect.github.com/middyjs/middy/pull/1241">middyjs/middy#1241</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/middyjs/middy/compare/5.5.0...5.5.1">https://github.com/middyjs/middy/compare/5.5.0...5.5.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/middyjs/middy/commit/f50d2352be04a92ce8e6352d70d218242f714633"><code>f50d235</code></a>
chore: version bump</li>
<li>See full diff in <a
href="https://github.com/middyjs/middy/commits/5.5.1/packages/http-header-normalizer">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -19,7 +19,7 @@
     "@aws-lambda-powertools/parameters": "^2.9.0",
     "@aws-sdk/client-secrets-manager": "^3.670.0",
     "@middy/core": "^5.5.1",
-    "@middy/http-header-normalizer": "^5.5.0",
+    "@middy/http-header-normalizer": "^5.5.1",
     "@middy/input-output-logger": "^5.5.1",
     "@nhs/fhir-middy-error-handler": "^2.1.8",
     "@NHSDigital/eps-spine-client": "^2.1.5",