Update Go version to 1.25.5 to address CVE-2025-61729

CVE-2025-61729 (GO-2025-4155) is a high-severity vulnerability affecting
Go versions < 1.24.11 and 1.25.0-1.25.4. The vulnerability causes
excessive resource consumption in printing error strings for host
certificate validation.

This commit updates the Go version from 1.25.4 to 1.25.5, which includes
the fix for this CVE.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2025-61729

Author: navinms711

go.mod

@@ -1,6 +1,6 @@
 module code.cloudfoundry.org/cli/v9
 
-go 1.25.4
+go 1.25.5
 
 require (
 	code.cloudfoundry.org/bytefmt v0.59.0