ci: bump Node-20-deprecated GitHub Actions

[palango]

Bumps the GitHub Actions that GitHub flagged as running on the deprecated Node 20 runtime (forced to Node 24 on 2026-06-16, Node 20 removed 2026-09-16).

• actions/checkout v4 → v6
• actions/setup-node v4 → v6
• actions/cache v4 → v5
• actions/cache/restore v3 → v5
• actions/upload-artifact v4 → v7
• step-security/changed-files 3dbe17c… → 2e07db7… (v47.0.5, kept SHA-pinned)

Left as-is: actions/stale@v9 (behind, but not Node-20-deprecated) and the other third-party actions.

Based on pahor/viem-combined so the diff is just this change. The major bumps (upload-artifact v4→v7, cache v4→v5, checkout v6) have breaking-change history — this PR's CI run is the validation.

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PR-Codex overview

This PR updates various GitHub Actions workflows to use newer versions of actions, specifically upgrading from v4 to v6 for actions/checkout and actions/setup-node, and from v3 to v5 for actions/cache. It also upgrades actions/upload-artifact from v4 to v7.

Detailed summary

• Updated actions/checkout from v4 to v6 in multiple workflows.
• Updated actions/setup-node from v4 to v6 in multiple workflows.
• Updated actions/cache from v3 to v5 in multiple workflows.
• Updated actions/upload-artifact from v4 to v7 in multiple workflows.
• Updated step-security/changed-files to a newer version.

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[changeset-bot]

⚠️ No Changeset found

Latest commit: c143055

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size
require('@celo/actions') (cjs)	98.85 KB (0%)
import * from '@celo/actions' (esm)	23.55 KB (0%)
import { resolveAddress } from '@celo/actions' (esm)	23.49 KB (0%)
import { getGasPriceOnCelo } from '@celo/actions' (esm)	73 B (0%)
import { getAccountsContract } from '@celo/actions/contracts/accounts' (esm)	46.11 KB (0%)
import * from '@celo/actions/staking' (esm)	50.66 KB (0%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.34%. Comparing base (f5482b5) to head (c143055).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #781      +/-   ##
==========================================
- Coverage   70.16%   68.34%   -1.82%     
==========================================
  Files         114      152      +38     
  Lines        5905     8824    +2919     
  Branches     1189     1656     +467     
==========================================
+ Hits         4143     6031    +1888     
- Misses       1691     2721    +1030     
- Partials       71       72       +1     

Components	Coverage Δ
celocli	∅ <ø> (∅)
sdk	67.22% <ø> (-2.12%)	⬇️
wallets	73.68% <ø> (ø)
viem-sdks	94.15% <ø> (ø)

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