Upgrade: [dependabot] - bump @middy/core from 5.5.1 to 6.1.6

Bumps [@middy/core](https://github.com/middyjs/middy/tree/HEAD/packages/core) from 5.5.1 to 6.1.6.
- [Release notes](https://github.com/middyjs/middy/releases)
- [Changelog](https://github.com/middyjs/middy/blob/main/docs/CHANGELOG.md)
- [Commits](https://github.com/middyjs/middy/commits/6.1.6/packages/core)

---
updated-dependencies:
- dependency-name: "@middy/core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     },
     "dependencies": {
         "@aws-lambda-powertools/logger": "^2.16.0",
-        "@middy/core": "^5.5.1",
+        "@middy/core": "^6.1.6",
         "@middy/input-output-logger": "^6.1.5",
         "@nhs/fhir-middy-error-handler": "^2.1.26"
     }