build: update CI+release version to Go 1.25.5

This updates the toolchain which we require to build the LND
executable.

.golangci.yml

@@ -3,7 +3,7 @@ version: "2"
 run:
   # If you change this please also update GO_VERSION in Makefile (then run
   # `make lint` to see where else it needs to be updated as well).
-  go: "1.25.3"
+  go: "1.25.5"
 
   # Abort after 10 minutes.
   timeout: 10m