fix(manager/terragrunt): prevent overwriting versioning of GithubTags datasource (#19782)

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

lib/modules/manager/terragrunt/index.ts

 import { GitTagsDatasource } from '../../datasource/git-tags';
 import { GithubTagsDatasource } from '../../datasource/github-tags';
 import { TerraformModuleDatasource } from '../../datasource/terraform-module';
-import * as hashicorpVersioning from '../../versioning/hashicorp';
 
 export { extractPackageFile } from './extract';
 
@@ -14,5 +13,4 @@ export const supportedDatasources = [
 export const defaultConfig = {
   commitMessageTopic: 'Terragrunt dependency {{depName}}',
   fileMatch: ['(^|/)terragrunt\\.hcl$'],
-  versioning: hashicorpVersioning.id,
 };