Increse Blender version max limit to 5.99 as the B5 is comming

[agajdosi]

Bug Description

    search_blender_version_max: StringProperty(
        name="Maximum version (excluding, lower than)",
        default="4.99",
        description="Limit the assets by maximum version of Blender in which they were created, exluding the specified version and all newer versions from the search results. "
        + "Only assets created in LOWER THAN (< max) maximum version will be shown. Use semantic versioning format: X.Y.Z.\n\n"
        + "E.g.: exclude all Blender 4 assets by specifying 4, 4.0, or 4.0.0. Assets created in 3.6 and lower will be shown",
        update=search.search_update,
    )

Error Logs

No response

Steps to Reproduce