internal/proxydatasource: use LatestModuleVersions

For golang/go#44710

Change-Id: I070c7f446e94511006d1d97b0bdd6a380e012c63
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/298233
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>

internal/proxydatasource/datasource.go

@@ -109,11 +109,11 @@ func (ds *DataSource) getModule(ctx context.Context, modulePath, version string)
 		}
 		// Use the go.mod file at the raw latest version to fill in deprecation
 		// and retraction information.
-		rawLatest, err := fetch.RawLatestInfo(ctx, modulePath, ds.proxyClient, nil)
+		lmv, err := fetch.LatestModuleVersions(ctx, modulePath, ds.proxyClient, nil)
 		if err != nil {
 			res.Error = err
 		} else {
-			rawLatest.PopulateModuleInfo(&m.ModuleInfo)
+			lmv.PopulateModuleInfo(&m.ModuleInfo)
 		}
 	}