chore(tests): tracer test relaxed [backport 2.0] (#7172)

Backport 5313bda from #7090 to 2.0.

relax a condition to get less flaky failures on CI in tracer test.

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
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[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

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- [x] Description motivates each change.
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[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
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Co-authored-by: Christophe Papazian <[email protected]>

Author: github-actions[bot]

tests/tracer/runtime/test_metric_collectors.py

@@ -141,7 +141,7 @@ def test_gen1_changes(self):
         # create reference
         a = []
         collected = collector.collect([GC_COUNT_GEN0])
-        self.assertGreater(collected[0][1], start[0])
+        self.assertGreaterEqual(collected[0][1], start[0])
 
         # delete reference and collect
         del a