docs: update the Udash versions used by the documentation examples

[updateclibot]

deps(dockercompose): bump "ghcr.io/updatecli/udash" digest

deps: update Docker image "ghcr.io/updatecli/udash" to "v0.20.0"

change detected: * key "$.services.server.image" updated from "ghcr.io/updatecli/udash:v0.19.1@sha256:45e2285583879ef356e8138b14776defb6e42c3242b9b4fdfa07eb286d1ec03b" to "ghcr.io/updatecli/udash:v0.20.0@sha256:e208c1b4e94ca6cd0951eafcc1e79b1a58444f9057b995369886164289c2f4c2", in file "assets/code_example/docs/udash/quick-start/docker-compose.yaml"

GitHub Action workflow link

deps(dockercompose): bump "ghcr.io/updatecli/udash-front" digest

deps: update Docker image "ghcr.io/updatecli/udash-front" to "v0.28.0"

change detected: * key "$.services.front.image" updated from "ghcr.io/updatecli/udash-front:v0.27.1@sha256:b5e8107d6edd5329275cbcd33144d712aeea6c4e958ccc072db3c7e9968854a5" to "ghcr.io/updatecli/udash-front:v0.28.0@sha256:d94a0ac05acd1f5cf9a0af3f5cffca38d5aac238036a76cad2ca599a0d24a9be", in file "assets/code_example/docs/udash/quick-start/docker-compose.yaml"

GitHub Action workflow link

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