🐛 Add --no-sync to all uv run invocations

[Copilot]

uv run without --no-sync triggers a full dependency sync on every invocation, which is redundant in CI where uv sync is already called explicitly beforehand.

Changes

• build-package.yml: add --no-sync to uv run nox calls in both lint and test jobs
• publish-package.yml: add --no-sync to uv run python call that extracts the package version
• sync-api-backup.yml: add --no-sync to uv run gitmojis sync

# Before
uv run nox -s ${{ matrix.session }}

# After
uv run --no-sync nox -s ${{ matrix.session }}