Add exec to reth command

[eskp]

Without exec the shell spawns a new child process to run the command. So then when we send the container a kill signal, for example when rolling out a new deployment, reth process doesn't get this signal. So then Pod just sits in "Terminating" until timed out.

[barnabasbusa]

@eskp pls bump the version of reth + bump the version in ethereum-node, then run make docs from the root, and add this to the PR.

[eskp]

done @barnabasbusa , thanks

[barnabasbusa]

Closing in favor of: #269