ci: Add schedule to update-deps workflow (#292)

Issue #, if available:

*Description of changes:*
Schedule [update
dependencies](/~https://github.com/runfinch/finch/blob/main/.github/workflows/update-deps.yaml)
workflow which is currently triggered only by `workflow_dispatch`. This
workflow will run after dependencies are built in `finch-core` by
/~https://github.com/runfinch/finch-core/blob/main/.github/workflows/release.yaml(runs
at 9 am UTC on Tuesday) at 11 am UTC on Tuesday.
*Testing done:*
Yes. 
#291

- [X] I've reviewed the guidance in CONTRIBUTING.md


#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Vishwas Siravara <siravara@amazon.com>

.github/workflows/update-deps.yaml

@@ -1,5 +1,7 @@
 name: Update dependencies
 on:
+  schedule:
+    - cron: '0 11 * * 2'
   workflow_dispatch:
 
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