Bump @anthropic-ai/mcpb from 1.1.1 to 1.1.5

Bumps @anthropic-ai/mcpb from 1.1.1 to 1.1.5.

---
updated-dependencies:
- dependency-name: "@anthropic-ai/mcpb"
  dependency-version: 1.1.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]