fix(renovate): add missing -- in npm run ng update command (#2847)

## Proposed change

Fix an issue in renovate `otter-ng-update` preset when used with npm:
`--` was missing in the command, so `ng update` options such as
`--allow-dirty` were not taken into account.

## Related issues

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tools/renovate/tasks/otter-ng-update.json

@@ -11,7 +11,7 @@
       "postUpgradeTasks": {
         "commands": [
           "{{arg0}} install",
-          "{{arg0}} run ng update {{{depName}}} --from={{{currentVersion}}} --to={{{newVersion}}} --migrate-only --allow-dirty --force"
+          "{{arg0}} run ng update {{{depName}}} {{#if (equals '{{arg0}}' 'npm')}}-- {{/if}}--from={{{currentVersion}}} --to={{{newVersion}}} --migrate-only --allow-dirty --force"
         ],
         "fileFilters": [
           "!**/.{npmrc,yarnrc*}"