docs: update wasmCloud version to 2.10.3

[ericgregory]

Automated version bump from the wasmCloud release pipeline.

Updates src/wasmcloud-version.ts to 2.10.3.
The remark plugin propagates the new value to all {{WASMCLOUD_VERSION}} placeholders
in code blocks across the docs at build time — no other files need editing.

Merging this PR with the release-bump label will auto-cut docs-v2.10.3
(via .github/workflows/tag-after-merge.yml), which fires release-docs.yml and
publishes the offline docs image + tarball.

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