🔖 Bump version to 2.5.5 and update changelog #11819

Job	Run time
Build and check documentation	1m 59s
End-to-end tests, chromium	10m 23s
Run the Django test suite	10m 30s
End-to-end tests, firefox	13m 15s
Run the Django test suite in reverse	8m 28s
End-to-end tests, webkit	10m 26s
Set up docker build 'dynamic' env variables	1s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	8m 38s
docker_build (production) / Build image	8m 23s
Scan docker image	2m 21s
Check for unexepected OAS changes	9s
Validate OAS	15s
Generate Postman collection from OAS	13s
Generate SDKs from OAS	39s
Push Docker image (production)	1m 2s
Push Docker image (extensions, all-extensions-)	1m 1s
update-docker-readme / Generate and update Docker Hub description	25s
	1h 18m 8s

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