build(deps): bump ejs and @graphprotocol/graph-cli in /tools/subgraph-example (#2446)

build(deps): bump ejs and @graphprotocol/graph-cli

Bumps [ejs](https://github.com/mde/ejs) and @graphprotocol/graph-cli. These dependencies needed to be updated together.

Updates `ejs` from 3.1.9 to 3.1.10
- [Release notes](https://github.com/mde/ejs/releases)
- [Commits](mde/ejs@v3.1.9...v3.1.10)

Updates `@graphprotocol/graph-cli` from 0.55.0 to 0.71.0

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: "@graphprotocol/graph-cli"
  dependency-type: indirect
...

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

Author: dependabot[bot]