chore(deps): update go toolchain directive to v1.26.4

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

Author: renovate[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/vshn/appcat-cli
 
 go 1.24.0
 
-toolchain go1.26.3
+toolchain go1.26.4
 
 require (
 	github.com/sirupsen/logrus v1.9.4