Bump pangeo/base-image from 2024.06.24 to 2024.06.28 in /.devcontainer (#280)

Bumps pangeo/base-image from 2024.06.24 to 2024.06.28.

---
updated-dependencies:
- dependency-name: pangeo/base-image
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.devcontainer/Dockerfile

@@ -1 +1 @@
-FROM pangeo/base-image:2024.06.24
+FROM pangeo/base-image:2024.06.28