Renovate[bot]: Update actions/checkout digest to 8ade135

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	3df4ab1 -> 8ade135

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Pre-merge checks

• Make sure the GitHub Actions tests are passing.

• Run bin/compare-build-branch.sh locally on this branch and confirm that this PR is not causing unexpected changes to the build. Requirements to run this script: grunt build and nvm.

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[mattyrob]

PR updated checkout action for workflow tests to 4.1, no build changes expected.

Local run of bin/compare-build-branch.sh renovate/actions-checkout-digest returned:

Diff results for branch: renovate/actions-checkout-digest
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       0 build-compare.diff