chore: update Go version to go1.26.1

core/go.mod

@@ -1,6 +1,6 @@
 module github.com/opencost/opencost/core
 
-go 1.25.5
+go 1.26.1
 
 require (
 	cloud.google.com/go/storage v1.60.0

go.mod

@@ -7,7 +7,7 @@ replace (
 	github.com/opencost/opencost/modules/prometheus-source => ./modules/prometheus-source
 )
 
-go 1.25.5
+go 1.26.1
 
 require (
 	cloud.google.com/go/bigquery v1.74.0

modules/collector-source/go.mod

@@ -2,7 +2,7 @@ module github.com/opencost/opencost/modules/collector-source
 
 replace github.com/opencost/opencost/core => ./../../core
 
-go 1.25.5
+go 1.26.1
 
 require (
 	github.com/julienschmidt/httprouter v1.3.0

modules/prometheus-source/go.mod

@@ -1,6 +1,6 @@
 module github.com/opencost/opencost/modules/prometheus-source
 
-go 1.25.5
+go 1.26.1
 
 replace (
 	github.com/golang/lint => golang.org/x/lint v0.0.0-20180702182130-06c8688daad7