chore: Bump Go to 1.26.3 (#516)

Signed-off-by: Zixin Zhou <zhouzixin@apache.org>

Author: CodePrometheus

go.mod

@@ -2,7 +2,7 @@ module github.com/tetratelabs/func-e
 
 // Before updating minor check compatibility with Envoy Gateway.
 // See https://github.com/envoyproxy/gateway/blob/main/go.mod#L3
-go 1.26.2
+go 1.26.3
 
 require (
 	github.com/shirou/gopsutil/v4 v4.26.3