chore(deps): update go module directive to v1.26.3 (#188)

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

Author: renovate[bot]

go.mod

@@ -1,6 +1,6 @@
 module github.com/sap/admission-webhook-runtime
 
-go 1.26.2
+go 1.26.3
 
 require (
 	github.com/go-logr/logr v1.4.3