[legacy-framework] Fix invoke return type

[Skn0tt]

Closes: blitz-js/legacy-framework#515

What are the changes and their implications?

Fixes blitz-js/legacy-framework#515.

Checklist

• Changes covered by tests (tests added if needed)
• PR submitted to blitzjs.com for any user facing changes

[Skn0tt]

I've tested with @Swapnull's https://github.com/Swapnull/invoke-any-error-blitz, and the error went away.

@flybayer should we add unit tests for this? Do we already have type tests in place?

[github-actions]

Size Change: 0 B

Total Size: 214 kB

ℹ️ View Unchanged

Filename	Size	Change
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packages/babel-preset/dist/blitzjs-babel-preset.cjs.js	150 B	0 B
packages/babel-preset/dist/blitzjs-babel-preset.cjs.prod.js	815 B	0 B
packages/babel-preset/dist/blitzjs-babel-preset.esm.js	752 B	0 B
packages/blitz/cli/dist/blitz-cli.cjs.dev.js	1.47 kB	0 B
packages/blitz/cli/dist/blitz-cli.cjs.js	142 B	0 B
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packages/blitz/dist/blitz.esm.js	51 B	0 B
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packages/config/dist/blitzjs-config.cjs.js	146 B	0 B
packages/config/dist/blitzjs-config.cjs.prod.js	1 kB	0 B
packages/config/dist/blitzjs-config.esm.js	878 B	0 B
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packages/core/dist/blitzjs-core.cjs.js	144 B	0 B
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packages/display/dist/blitzjs-display.esm.js	1.86 kB	0 B
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packages/file-pipeline/dist/blitzjs-file-pipeline.cjs.js	150 B	0 B
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packages/generator/dist/templates/app/babel.config.js	78 B	0 B
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packages/server/dist/blitzjs-server.cjs.dev.js	21.2 kB	0 B
packages/server/dist/blitzjs-server.cjs.js	145 B	0 B
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packages/server/dist/blitzjs-server.esm.js	21 kB	0 B

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[flybayer]

Thanks! We don't currently have many type tests. I want to set up an integration testing structure like the next.js repo where we can add tests for things like this (and stop using examples as tests :D)