fix(pre-commit): allow hooks in the format git:// (#9858)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

lib/manager/pre-commit/__fixtures__/.pre-commit-config.yaml

@@ -8,3 +8,7 @@ repos:
     -   id: end-of-file-fixer
     -   id: check-yaml
     -   id: check-added-large-files
+- repo: git://github.com/pre-commit/pre-commit-hooks
+  rev: v2.1.0
+  hooks:
+    - id: check-merge-conflict

lib/manager/pre-commit/__snapshots__/extract.spec.ts.snap

@@ -118,6 +118,13 @@ Object {
       "depType": "repository",
       "lookupName": "pre-commit/pre-commit-hooks",
     },
+    Object {
+      "currentValue": "v2.1.0",
+      "datasource": "github-tags",
+      "depName": "pre-commit/pre-commit-hooks",
+      "depType": "repository",
+      "lookupName": "pre-commit/pre-commit-hooks",
+    },
   ],
 }
 `;

lib/manager/pre-commit/extract.ts

@@ -92,6 +92,8 @@ function extractDependency(
     regEx('^https?:\\/\\/(?<hostname>[^\\/]+)\\/(?<depName>\\S*)'),
     // This splits "git@private.registry.com:user/repo" -> "private.registry.com" "user/repo
     regEx('^git@(?<hostname>[^:]+):(?<depName>\\S*)'),
+    // This split "git://github.com/pre-commit/pre-commit-hooks" -> "github.com" "pre-commit/pre-commit-hooks"
+    /^git:\/\/(?<hostname>[^/]+)\/(?<depName>\S*)/,
   ];
   for (const urlMatcher of urlMatchers) {
     const match = urlMatcher.exec(repository);