chore(deps): update dependency go to v1.26.4

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Author: red-hat-konflux[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/redhat-appstudio/dora-metrics
 
 go 1.25.0
 
-toolchain go1.26.3
+toolchain go1.26.4
 
 require (
 	github.com/argoproj/argo-cd/v2 v2.14.20