fix: 64 bit linux download link for install.sh script (#4727)

## Description

install.sh from docs references x86_64 instead of amd64 for linux 64 bit
download links:
```
curl -sSfL https://cli.inngest.com/install.sh | sh
inngestcl: info checking GitHub for latest version
inngestcl: debug http https://api.github.com/repos/inngest/inngest/releases/latest
inngestcl: debug downloading files into /tmp/tmp.sRml2xNRcn
inngestcl: debug http https://github.com/inngest/inngest/releases/download/v1.41.1/inngest_1.41.1_linux_x86_64.tar.gz
curl: (22) The requested URL returned error: 404
```

## Release note

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notes. -->
None.

## Migration note

<!-- Upgrade, deployment, config, schema, or compatibility notes. Use
"None" if none. -->
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