Bump go from 1.26.3 to v1.26.4 (#1580)

Co-authored-by: dghubble-renovate[bot] <119624128+dghubble-renovate[bot]@users.noreply.github.com>

Author: dghubble-renovate[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/poseidon/matchbox
 
 go 1.25.0
 
-toolchain go1.26.3
+toolchain go1.26.4
 
 require (
 	github.com/coreos/butane v0.28.0