build(go): bump to 1.26.4 (#285)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot

.taskfiles/runtime.Taskfile.yml

@@ -9,7 +9,7 @@ vars:
       uv: 0.11.16
       fnm: 1.39.0
       pwsh: latest
-      golang: 1.26.3
+      golang: 1.26.4
   RUNTIME_INSTALLER_SHA:
     map:
       fnm: bfb186034978b1ddaf87501eb1633bdc42a5c0a6 # 2026-03-09 Schniz/fnm .ci/install.sh

go.mod

@@ -1,6 +1,6 @@
 module github.com/Azure/mpf
 
-go 1.26.3
+go 1.26.4
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.1