Bump semver and truffle in /template/examples/contract-erc20/truffle (#…

…1110)

Bumps [semver](https://github.com/npm/node-semver) to 7.5.2 and updates ancestor dependency [truffle](https://github.com/trufflesuite/truffle/tree/HEAD/packages/truffle). These dependencies need to be updated together.


Updates `semver` from 7.3.7 to 7.5.2
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/main/CHANGELOG.md)
- [Commits](npm/node-semver@v7.3.7...v7.5.2)

Updates `truffle` from 5.6.7 to 5.10.2
- [Release notes](https://github.com/trufflesuite/truffle/releases)
- [Commits](https://github.com/trufflesuite/truffle/commits/[email protected]/packages/truffle)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: indirect
- dependency-name: truffle
  dependency-type: direct:production
...

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