chore: Bump go version to 1.26.4 (#6750)

* chore: Bump to go version 1.26.4

* chore: Bump golangci-lint version

* fix: Update URL to be ipv6 safe

plugins/boundary/mains/aws/go.mod

@@ -1,6 +1,6 @@
 module github.com/hashicorp/boundary/plugins/boundary/mains/aws
 
-go 1.25.7
+go 1.26.4
 
 require (
 	github.com/hashicorp/boundary-plugin-aws v0.5.2

plugins/boundary/mains/azure/go.mod

@@ -1,6 +1,6 @@
 module github.com/hashicorp/boundary/plugins/boundary/mains/azure
 
-go 1.25.7
+go 1.26.4
 
 require (
 	github.com/hashicorp/boundary-plugin-azure v0.2.0

plugins/boundary/mains/gcp/go.mod

@@ -1,6 +1,6 @@
 module github.com/hashicorp/boundary/plugins/boundary/mains/gcp
 
-go 1.25.7
+go 1.26.4
 
 require (
 	github.com/hashicorp/boundary-plugin-gcp v0.1.0

plugins/boundary/mains/minio/go.mod

@@ -1,6 +1,6 @@
 module github.com/hashicorp/boundary/plugins/boundary/mains/minio
 
-go 1.25.7
+go 1.26.4
 
 require (
 	github.com/hashicorp/boundary-plugin-minio v0.1.7