Update OpenAPI specs to Bee v2.8.1

[yjkellyjoo]

Automated update to Bee v2.8.1.

Source: https://github.com/ethersphere/bee/tree/v2.8.1/openapi

What changed

• openapi/Swarm.yaml and openapi/SwarmCommon.yaml pulled from the tagged commit.
• Bee version strings bumped 2.8.0 → 2.8.1 in the install docs.

⚠️ Please review before merging

The version-string replacement is best-effort (literal semver swap in a fixed set
of doc files) and can miss or over-match. Skim the doc diff. Merging this PR triggers
the tag-on-openapi-merge workflow, which tags the merge commit v2.8.1
and (with a PAT configured) kicks off the gh-pages deploy.

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[GasperX93]

LGTM overall — the version bumps are careful (even the sample log outputs got the real 2.8.1 commit hash), staking.md changes check out, and #824 landed first as required.

One over-match from the literal semver swap, worth fixing before merge — in docs/bee/working-with-bee/configuration.md, the chequebook verification info box:

It was introduced in Bee v2.8.1.

should stay v2.8.0 — that's a historical statement about when the feature shipped (it was introduced in 2.8.0), not a current-version reference. Single-word revert.

Approving since it's a one-liner; happy to re-check after the fix.

[yjkellyjoo]

It was introduced in Bee v2.8.1.

should stay v2.8.0 — that's a historical statement about when the feature shipped (it was introduced in 2.8.0), not a current-version reference. Single-word revert.

Good catch, rollbacked. 03ca2fc