chore(deps): update dependency go to v1.25.6 (#464)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -1,6 +1,6 @@
 module github.com/newrelic/newrelic-k8s-metrics-adapter
 
-go 1.25.5
+go 1.25.6
 
 require (
 	github.com/elazarl/goproxy v0.0.0-20241218172127-ac55c7698e0d