Bump got and swarm-js in /template/examples/contract-erc20 (paritytec…

…h#886)

Bumps [got](https://github.com/sindresorhus/got) and [swarm-js](https://github.com/maiavictor/swarm-js). These dependencies needed to be updated together.

Updates `got` from 7.1.0 to 11.8.5
- [Release notes](https://github.com/sindresorhus/got/releases)
- [Commits](sindresorhus/got@v7.1.0...v11.8.5)

Updates `swarm-js` from 0.1.40 to 0.1.42
- [Release notes](https://github.com/maiavictor/swarm-js/releases)
- [Commits](https://github.com/maiavictor/swarm-js/commits)

---
updated-dependencies:
- dependency-name: got
  dependency-type: indirect
- dependency-name: swarm-js
  dependency-type: indirect
...

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