build(deps): bump syn from 1.0.62 to 1.0.67

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.62 to 1.0.67.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.62...1.0.67)

Signed-off-by: dependabot-preview[bot] <[email protected]>

instance manager: remove panic

instance manager: remove panic

block_stream: have a fallback timeout for chain head updates

Unrevert "ethereum: Rebase web3, use upstream ethabi"

This reverts commit 952b796.

*: Downgrade to tokio 0.2

increase blocking threads

ES: Fix memory leak and logs not flushing

graph: Updates notes on web3 and ethabi depedencies