Update tiny image from alpine:3.17 to alpine:3.24

[khalilswdp]

Updates the default tiny image used for startup capability probes (runInsideDocker,
the mountable-file check) from alpine:3.17 to alpine:3.24. Alpine 3.17 reached
end of support in November 2024 and no longer receives security updates; 3.24 is the
current stable release.

Note on the dependency-upgrade policy: this pin is a constant in
DockerClientFactory, not a build dependency, so it is not covered by the automated
weekly upgrade process — hence the manual bump.

Changes

• Bump TINY_IMAGE in DockerClientFactory and update the documented default for
  the tinyimage.container.image property in docs/features/configuration.md.
  The property itself is unchanged — users overriding the tiny image via
  tinyimage.container.image are unaffected.
• Update all co-located references to the old tag for consistency: core test images
  (TestImages), test fixtures (Dockerfile and compose files), docs examples, and
  the Spock module's test images.

No behavior changes beyond the image tag.