ci: bump remaining Node 20 actions to Node 24 runtimes

[hardbyte]

GitHub forces Node.js 20 actions to run on Node 24 starting June 16th, 2026 and removes Node 20 from runners in September 2026. Most of this repo is already on node24 majors; this bumps the stragglers:

Workflow	Action	From	To	Notes
docs-pages.yml	actions/setup-node	v4	v6	node-version: 20 is the docs build toolchain, unrelated to the action runtime
docs-pages.yml	actions/configure-pages	v5	v6	node24 only
docs-pages.yml	actions/deploy-pages	v4	v5	node24 only
docs-pages.yml	actions/upload-pages-artifact	v3	v5	composite, but v3 internally runs upload-artifact@v4 (node20); v5 pins v7
operator-fairness-load.yml	actions/github-script	v7	v9	script only uses injected github/context/core — unaffected by v9's ESM break of require('@actions/github')

Left as-is: release.yml's upload-artifact@v6/download-artifact@v7 (already node24-default), docker/* (all node24 at current pins), attest@v4/softprops/action-gh-release@v3 (node24), cosign-installer (composite), Swatinem/rust-cache@v2 (floating major resolves to node24), and the local setup-e2e composite (uses docker/setup-buildx-action@v4, node24).

Same sweep as thepartly/reflectapi#172.

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Reviewing files that changed from the base of the PR and between f9e8818 and d8b66ef.

📒 Files selected for processing (2)

• .github/workflows/docs-pages.yml
• .github/workflows/operator-fairness-load.yml

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