Update hg actions

[roivaz]

• Updates versions of the actions used.
• Remove the caching actions as actions/setup-go@v4 already has built-in caching enabled by default
• Add an action to publish the operator catalog when changes are made to the stable channel

/kind feature
/priority important-longterm
/assign

[roivaz]

/ok-to-test

[slopezz]

@roivaz Can you please update the release doc https://github.com/3scale-ops/marin3r/blob/main/docs/release.md according to the new procedure of both:

• Alpha (single PR, manual executions of the 2 tagets)
• Stable (2 PRs on specific order with specific target each)
  ?

[roivaz]

let's first test that this actually works... I'll update the docs in an upcoming PR 😅

[slopezz]

/lgtm

[3scale-robot]

LGTM label has been added.

Git tree hash: f0f99deabe2eea519833e5bfcbd1e167e6de9c43

[roivaz]

/approve

[3scale-robot]

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