metrics: bump (#7523)

arnetheduck · siddarthkay · commit f1275fa004ec · 2025-09-24T17:30:43.000+05:30
* remove `_created` label from gauges (not needed, non-standard and
takes up a lot of "space" in the metrics endpoint)
* various threading fixes
diff --git a/vendor/nim-metrics b/vendor/nim-metrics
@@ -1 +1 @@
-Subproject commit 11d0cddfb0e711aa2a8c75d1892ae24a64c299fc
+Subproject commit ecf64c6078d1276d3b7d9b3d931fbdb70004db11
