fix(policy-templates): Add more actions to ServerlessRepoReadWriteAccessPolicy

[jlhood]

Issue #, if available:

Description of changes:
SAR policy template was missing UpdateApplication operation. Added that and also new ListApplicationDependencies API.

Description of how you validated changes:
make pr passes. Verified new actions against this docs page.

Checklist:

• [ x ] Write/update tests
• [ x ] make pr passes
• n/a Update documentation - This page will need to be updated, but only after release.

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

[codecov-io]

Codecov Report

Merging #847 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #847   +/-   ##
========================================
  Coverage    94.56%   94.56%           
========================================
  Files           67       67           
  Lines         2833     2833           
  Branches       508      508           
========================================
  Hits          2679     2679           
  Misses          82       82           
  Partials        72       72

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