[Tile-serving] [openstreetmap/osm2pgsql] Github Actions: fix CI badge and run apt update (#1321)

[Sarah Hoffmann]

This fixes the recent CI breaks.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1321

-- Commit Summary --

  * actions: fix CI badge and run apt update

-- File Changes --

    M .github/actions/ubuntu-prerequisites/action.yml (1)
    M README.md (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1321.patch
https://github.com/openstreetmap/osm2pgsql/pull/1321.diff

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