improve(pdf-loader): update error message to specify support for pdf-…

[sapenlei]

…parse v1 only

description

• Update PDFLoader failure message to explicitly state that only pdf-parse v1 is supported and provide a concrete install command example (npm install pdf-parse@^1).
• Addresses user confusion when installing pdf-parse v2 by making the version requirement explicit.
• pdf-parse latest version is v2 and is incompatible with current implementation; previous message was vague and led users to install v2 inadvertently.

[changeset-bot]

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Latest commit: a15873b

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