fix: can't inspect ubuntu:24.04 with Podman (wagoodman#476)

The problem was caused by `net/url.Parse()`:
```
panic: parse "podman://ubuntu:24.04": invalid port ":24.04" after host
```

Failure:
```
$ ./dive podman://ubuntu:24.04
Image Source: docker://podman://ubuntu:24.04
Fetching image... (this can take a while for large images)
Handler not available locally. Trying to pull 'podman://ubuntu:24.04'...
cannot fetch image
cannot find docker client executable
```

Success:
```
$ ./dive podman://ubuntu:24.04
Image Source: podman://ubuntu:24.04
...

$ ./dive ubuntu:24.04 --source podman
Image Source: podman://ubuntu:24.04
...

$ ./dive podman://ubuntu:24.04 --source docker
Image Source: podman://ubuntu:24.04
...
```

Fixes wagoodman#475

Co-authored-by: Anatoli Babenia <[email protected]>

dive/get_image_resolver.go

@@ -2,7 +2,6 @@ package dive
 
 import (
 	"fmt"
-	"net/url"
 	"strings"
 
 	"github.com/wagoodman/dive/dive/image"
@@ -41,14 +40,13 @@ func ParseImageSource(r string) ImageSource {
 }
 
 func DeriveImageSource(image string) (ImageSource, string) {
-	u, err := url.Parse(image)
-	if err != nil {
+	s := strings.SplitN(image, "://", 2)
+	if len(s) < 2 {
 		return SourceUnknown, ""
 	}
+	scheme, imageSource := s[0], s[1]
 
-	imageSource := strings.TrimPrefix(image, u.Scheme+"://")
-
-	switch u.Scheme {
+	switch scheme {
 	case SourceDockerEngine.String():
 		return SourceDockerEngine, imageSource
 	case SourcePodmanEngine.String():