Bump content/specs from 4457d66 to 73a3de4 (#786)

Bumps [content/specs](https://github.com/scientific-python/specs) from `4457d66` to `73a3de4`.
- [Commits](scientific-python/specs@4457d66...73a3de4)

---
updated-dependencies:
- dependency-name: content/specs
  dependency-version: 73a3de4f0962b71c73378ed9e0900bcbc7534f56
  dependency-type: direct:production
...

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

Author: dependabot[bot]