Fix Go 1.25.12 checksum constants in ensure-go-installed

Author: Copilot

script/ensure-go-installed

@@ -4,10 +4,10 @@ PREFERRED_GO_VERSION=go1.25.12
 SUPPORTED_GO_VERSIONS='go1.2[012345]'
 
 GO_PKG_DARWIN=${PREFERRED_GO_VERSION}.darwin-amd64.pkg
-GO_PKG_DARWIN_SHA=2254498b78a9bf81188e9daca5573df68ca04e5a67cbd508461b3f37506cef83
+GO_PKG_DARWIN_SHA=2c6b49d08e1ba340d0608d4c64ea5dbbd7f635763dec456fb87ad0d0d6629367
 
 GO_PKG_LINUX=${PREFERRED_GO_VERSION}.linux-amd64.tar.gz
-GO_PKG_LINUX_SHA=00859d7bd6defe8bf84d9db9e57b9a4467b2887c18cd93ae7460e713db774bc1
+GO_PKG_LINUX_SHA=234828b7a89e0e303d2556310ee549fbcf253d28de937bac3da13d6294262ac1
 
 export ROOTDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd $ROOTDIR