update excel export extension

[cstarcher]

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[Copilot]

Pull Request Overview

This PR updates the ExcelPackager to use the modern Excel file format by changing the file extension from "xls" to "xlsx".

• Changed the return value of getFileExtension() from "xls" to "xlsx"

Comments suppressed due to low confidence (1)

src/main/java/org/tdl/vireo/model/packager/ExcelPackager.java:53

• The MIME type 'application/vnd.ms-excel' is for the legacy .xls format, but the file extension has been changed to .xlsx. The MIME type should be updated to 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' to match the .xlsx format.

    public String getMimeType() {
        return "application/vnd.ms-excel";
    }

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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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