This reverts commit7a6b39a.

The "sketches-reports-source" input of the "arduino/report-size-deltas" GitHub Actions action defines the regularexpression that matches the names of the sketches report workflow artifacts produced by the "Compile Examples" workflow.The key string in the names of these artifacts was set to "sketches-report" when the "Compile Examples" workflow wasadjusted for compatibility with the breaking changes introduced by updating to version 4.x of the workflow's"actions/upload-artifact" GitHub Actions action dependency. The pattern set in the size deltas report workflow was"sketches-reports". The "s" at the end of that pattern caused it to no longer match against the key string in theartifact names after that adjustment of the "Compile Examples" workflow, resulting in size deltas reports no longerbeing generated by the workflow.Although a minimal fix would be to simply remove the "s" from the end of the pattern, the decision was made to use amore strict regular expression. This will make it easier for maintainers and contributors to understand that this valueis a regular expression and the exact nature of how that regular expression functions (which is less clear when relyingon the "arduino/report-size-deltas" action's partial pattern matching behavior).