chore(ci): run Renovate dependency updates only on Tuesday (#76)

Narrows the Renovate schedule for regular package updates from every
weekday night (`* 0-5 * * 2-5`, Tue–Fri) to Tuesday nights only (`* 0-5
* * 2`), so the bot no longer opens dependency-update PRs every day. The
`lockFileMaintenance` schedule (Monday nights, `* 0-5 * * 1`) is left
unchanged.

Author: vdusek

renovate.json

@@ -32,5 +32,5 @@
     ],
     "minimumReleaseAge": "1 day",
     "internalChecksFilter": "strict",
-    "schedule": ["* 0-5 * * 2-5"]
+    "schedule": ["* 0-5 * * 2"]
 }