fix: upgrade Go to 1.25.7 to fix CVE-2025-68121 (#2002)

Upgrade Go version from 1.25.6 to 1.25.7 to address the HIGH severity
vulnerability CVE-2025-68121 in crypto/tls session resumption.

Fixed versions: 1.24.13, 1.25.7, 1.26.0-rc.3

(cherry picked from commit ae25e7d)

Author: coderzc

go.mod

@@ -1,6 +1,6 @@
 module github.com/streamnative/pulsarctl
 
-go 1.25.0
+go 1.25.7
 
 require (
 	github.com/apache/pulsar-client-go v0.18.0-candidate-1.0.20251222030102-3bb7d4eff361