chore(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	pin	v4 → v4.3.1
actions/setup-node	action	pin	v4 → v4.4.0
actions/upload-artifact	action	pin	v4 → v4.6.2
node (source)	engines	pin	>=20.0.0 → v26.5.0
node	uses-with	pin	20 → 20.20.2
pnpm/action-setup	action	pin	v3 → v3.0.0

Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pnpm-lock.yaml

[13:45:20.530] INFO (791): Installing tool node@25.8.1...
/opt/containerbase/tools/node/25.8.1/bin/node: either --use-openssl-ca or --use-system-ca can be used, not both
[13:45:27.549] ERROR (791): Command failed with exit code 9: node --version
[13:45:27.550] FATAL (791): Install tool node failed in 7s.