fix: mark renderer as optional

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

We test if renderer exists, so I think we can safely mark this as an optional type:

nitro/src/rollup/plugins/handlers.ts

Lines 19 to 25 in aa5a2f4

	if (nitro.options.renderer) {
	handlers.push({
	route: "/**",
	lazy: true,
	handler: nitro.options.renderer,
	});
	}

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@2dcd2c7). Click here to learn what that means.
The diff coverage is 100.00%.

❗ Current head f03127e differs from pull request most recent head 37dc54b. Consider uploading reports for the commit 37dc54b to get more accurate results

@@           Coverage Diff           @@
##             main    #1069   +/-   ##
=======================================
  Coverage        ?   67.32%           
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  Files           ?       62           
  Lines           ?     6292           
  Branches        ?      707           
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  Hits            ?     4236           
  Misses          ?     2042           
  Partials        ?       14           

Impacted Files	Coverage Δ
src/types/nitro.ts	100.00% <100.00%> (ø)

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[pi0]

What issue does this fix?

[danielroe]

removing renderer from nitro options when using nitro programmatically: https://github.com/nuxt/nuxt/pull/19825/files#diff-85b4fe47ac4284e88552626029d5147793563b4dcdab205cd8dc6afb190222aaR239-R240