chore: pin cue at v0.15.4 until we can bump to go1.25 (#8004)

Author: cameronmeissner

.github/workflows/validate-components.yml

@@ -16,7 +16,7 @@ jobs:
           GOPATH="$(go env | grep GOPATH | cut -d= -f2 | tr -d '"')"
           export PATH="$PATH:$GOPATH/bin"
           pushd /tmp
-          GO111MODULE=on go install cuelang.org/go/cmd/cue@latest
+          GO111MODULE=on go install cuelang.org/go/cmd/cue@v0.15.4
           popd
 
       - name: Validate components.json conforms to cue schema