Bump @graphql-tools/git-loader from 6.0.16 to 6.2.6 in /examples/graphql

Bumps [@graphql-tools/git-loader](https://github.com/ardatan/graphql-tools/tree/HEAD/packages/loaders/git) from 6.0.16 to 6.2.6.
- [Release notes](https://github.com/ardatan/graphql-tools/releases)
- [Changelog](https://github.com/ardatan/graphql-tools/blob/master/packages/loaders/git/CHANGELOG.md)
- [Commits](https://github.com/ardatan/graphql-tools/commits/@graphql-tools/git-loader@6.2.6/packages/loaders/git)

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Author: dependabot[bot]