Upgrade: [dependabot] - bump @aws-sdk/client-firehose

Bumps [@aws-sdk/client-firehose](https://github.com/aws/aws-sdk-js-v3/tree/HEAD/clients/client-firehose) from 3.669.0 to 3.670.0.
- [Release notes](https://github.com/aws/aws-sdk-js-v3/releases)
- [Changelog](https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-firehose/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js-v3/commits/v3.670.0/clients/client-firehose)

---
updated-dependencies:
- dependency-name: "@aws-sdk/client-firehose"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/splunkProcessor/package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@aws-lambda-powertools/logger": "^2.9.0",
-    "@aws-sdk/client-firehose": "^3.669.0",
+    "@aws-sdk/client-firehose": "^3.670.0",
     "@aws-sdk/client-kinesis": "^3.670.0",
     "aws-sdk": "^2.1691.0"
   }