🔖 Bump version to 2.5.5 and update changelog #11820

Job	Run time
Run the Django test suite	10m 15s
Run the Django test suite in reverse	8m 5s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	2m 3s
End-to-end tests, chromium	10m 10s
End-to-end tests, firefox	11m 41s
End-to-end tests, webkit	10m 35s
docker_build (production) / Build image	8m 59s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	8m 28s
Check for unexepected OAS changes	5s
Validate OAS	17s
Generate Postman collection from OAS	13s
Generate SDKs from OAS	40s
Scan docker image	2m 23s
Push Docker image (production)	1m 1s
Push Docker image (extensions, all-extensions-)	1m 13s
update-docker-readme / Generate and update Docker Hub description	10s
	1h 16m 19s

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