fix(deps): update github.com/emersion/go-ical digest to 439c63c

[renovate-sh-app]

This PR contains the following updates:

Package	Type	Update	Change
github.com/emersion/go-ical (changelog)	require	digest	fc1c9d8 -> 439c63c

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[github-actions]

😢 zizmor failed with exit code 14.

Expand for full output

error[unpinned-uses]: unpinned action reference
  --> ./.github/workflows/publish.yml:32:9
   |
32 |         uses: docker/[email protected]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ action is not pinned to a hash (required by blanket policy)
   |
   = note: audit confidence → High

error[unpinned-uses]: unpinned action reference
  --> ./.github/workflows/publish.yml:40:9
   |
40 |         uses: docker/[email protected]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ action is not pinned to a hash (required by blanket policy)
   |
   = note: audit confidence → High

error[unpinned-uses]: unpinned action reference
  --> ./.github/workflows/publish.yml:45:9
   |
45 |         uses: docker/[email protected]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ action is not pinned to a hash (required by blanket policy)
   |
   = note: audit confidence → High

14 findings (4 ignored, 7 suppressed): 0 informational, 0 low, 0 medium, 3 high