add version 1.3.0 to the changelog (Draegerwerk#260)

<!--- Provide a general summary of your changes in the title above -->
<!--- Link the corresponding issues after you created the pull request
-->

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)

## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
- [x] I have updated the [changelog](../CHANGELOG.md) accordingly.
- [ ] I have added tests to cover my changes.

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.3.0] - 2023-09-08
+
 ### Added
 
 - http_server_timeout parameter to the SdcDevice interface in addition to it already