Increase `checkSummaryValues` ranges to fix flakiness (#22227)

Co-authored-by: Rebeka <rebeka.dekany@overleaf.com>
GitOrigin-RevId: d6da0b1e66cf5cb4ef4dbed91ae468ffe5807e37

libraries/metrics/test/acceptance/metrics_tests.js

@@ -316,7 +316,7 @@ async function checkSummaryValues(key, values) {
   for (const quantile of Object.keys(values)) {
     expect(found[quantile]).to.be.within(
       values[quantile] - 5,
-      values[quantile] + 5,
+      values[quantile] + 15,
       `quantile: ${quantile}`
     )
   }