go_sdk: upgrade to 1.26.0 (#11304)

Fix Redis URI IPv6 test generation for Go 1.26

> net/url
>
> Parse now rejects malformed URLs containing colons in the host
subcomponent, such as http://::1/ or http://localhost:80:80/.
> URLs containing bracketed IPv6 addresses, such as http://[::1]/ are
still accepted.
> The new GODEBUG setting urlstrictcolons=0 restores the old behavior.

https://go.dev/doc/go1.26

Author: sluongng

MODULE.bazel.lock

@@ -96,9 +96,14 @@ func genURI(scheme, user, password, addr, database string) string {
 
 	if strings.HasPrefix(scheme, "redis") {
 		if host, port, err := net.SplitHostPort(addr); err == nil {
-			hostport = host
 			if port != "" {
 				hostport = net.JoinHostPort(host, port)
+			} else if strings.Contains(host, ":") {
+				// Keep the trailing ":" so go-redis can default the port without
+				// double-bracketing IPv6 hosts.
+				hostport = net.JoinHostPort(host, port)
+			} else {
+				hostport = host
 			}
 		} else {
 			return ""

enterprise/server/util/redisutil/redisutil_test.go

@@ -1,6 +1,6 @@
 module github.com/buildbuddy-io/buildbuddy
 
-go 1.25.6
+go 1.26.0
 
 // Device Manager
 tool gitlab.com/arm-research/smarter/smarter-device-manager