Docs: Move SAM examples to Node18

[dreamorosi]

What were you searching in the docs?

After updating the repo to use Node.js 18, I want the SAM examples to also use the runtime.

Is this related to an existing documentation section?

No response

How can we improve?

Now that #1192 has been merged, we can move the SAM examples to Node.js 18.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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