fix: gitref -> gitRef

lib/datasource/common.ts

@@ -16,7 +16,7 @@ export type DigestConfig = Config;
 
 export interface Release {
   changelogUrl?: string;
-  gitref?: string;
+  gitRef?: string;
   isDeprecated?: boolean;
 
   releaseTimestamp?: any;

lib/datasource/git-tags/index.ts

@@ -37,7 +37,7 @@ export async function getPkgReleases({
       sourceUrl,
       releases: tags.map(tag => ({
         version: semver.isValid(tag),
-        gitref: tag,
+        gitRef: tag,
       })),
     };