kubectl manifests do not support URL references

### Expected behavior
Successfully deploy URL manifests

### Actual behavior
invalid skaffold config: skaffold config named "/Users/USERNAME/dep1/skaffold.yaml" referenced file "/Users/USERNAME/dep1/https:/exmaple.com/deployer.yaml" that could not be found. Verify that file "/Users/USERNAME/dep1/https:/exmaple.com/deployer.yaml" referenced in config "/Users/USERNAME/dep1/skaffold.yaml" exists and the path and naming are correct.
### Information

- Skaffold version: v.1.27.0
- Operating system: OSx
- Installed via: skaffold.dev
- Contents of skaffold.yaml:

```yaml
apiVersion: skaffold/v2beta19
kind: Config
requires:
- path: ../dep1/skaffold.yaml
build:
artifacts:
- image: myimage
kaniko:
cache: {}
verbosity: info
- image: helm-deployer-myimage
custom:
buildCommand: ./build.sh
requires:
- image: myimage
alias: BUILT_IMAGE
tagPolicy:
gitCommit: {}
cluster:
dockerConfig:
secretName: mysecret
deploy:
kubectl:
manifests:
- https://exmaple.com/deployer.yaml

```

### Steps to reproduce the behavior

1. Create 2 skaffold yaml manifests
2. In first manifest specify a requirement (dependency) to the seconds one
3. on seconds manifest specify deploy.kubectl.manifests to URL manifest

invalid skaffold config: skaffold config named "/Users/USERNAME/dep1/skaffold.yaml" referenced file "/Users/USERNAME/dep1/https:/exmaple.com/deployer.yaml" that could not be found. Verify that file "/Users/USERNAME/dep1/https:/exmaple.com/deployer.yaml" referenced in config "/Users/USERNAME/dep1/skaffold.yaml" exists and the path and naming are correct.