Adjusted minimum coverage

As verified by a coverage report, phpdbg is not
reporting correct coverage for `array_map()` here,
and is skipping coverage for the closure inside
both log processors.

In turn, that leads to uncovered mutants being
reported, but that is not the case.

infection.json.dist

@@ -12,6 +12,6 @@
     "mutators": {
         "@default": true
     },
-    "minMsi": 97,
+    "minMsi": 95.4,
     "minCoveredMsi": 100
 }