Bump aws-sdk-rds from 1.255.0 to 1.256.0

Bumps [aws-sdk-rds](https://github.com/aws/aws-sdk-ruby) from 1.255.0 to 1.256.0.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/version-3/gems/aws-sdk-rds/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/commits)

---
updated-dependencies:
- dependency-name: aws-sdk-rds
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -147,7 +147,7 @@ GEM
     autoprefixer-rails (9.4.7)
       execjs
     aws-eventstream (1.3.0)
-    aws-partitions (1.996.0)
+    aws-partitions (1.997.0)
     aws-sdk-cloudfront (1.103.0)
       aws-sdk-core (~> 3, >= 3.210.0)
       aws-sigv4 (~> 1.5)
@@ -159,7 +159,7 @@ GEM
     aws-sdk-kms (1.95.0)
       aws-sdk-core (~> 3, >= 3.210.0)
       aws-sigv4 (~> 1.5)
-    aws-sdk-rds (1.255.0)
+    aws-sdk-rds (1.256.0)
       aws-sdk-core (~> 3, >= 3.210.0)
       aws-sigv4 (~> 1.5)
     aws-sdk-s3 (1.169.0)