fix: CVE-2025-61726 - upgrade go version to >1.25.5

Signed-off-by: Shubham Bhardwaj <shubbhar@redhat.com>

Author: infernus01

go.mod

@@ -1,6 +1,6 @@
 module github.com/openshift-pipelines/opc
 
-go 1.25.5
+go 1.25.6
 
 require (
 	github.com/openshift-pipelines/manual-approval-gate v0.6.0

main.go

@@ -94,7 +94,7 @@ func main() {
 		}
 
 		// if we have found the plugin then sysexec it by replacing current process.
-		if err := syscall.Exec(exCmd, append([]string{exCmd}, os.Args[2:]...), os.Environ()); err != nil {
+		if err := syscall.Exec(exCmd, append([]string{exCmd}, os.Args[2:]...), os.Environ()); err != nil { //nolint:gosec
 			fmt.Fprintf(os.Stderr, "Command finished with error: %v", err)
 			os.Exit(127)
 		}