Use rake 13.x instead of 12.x

Use rake 13.x instead of 12.x to grasp the intention of !1667 (merged)

Note: Rake 13.x is included in Ruby 2.7 through 3.1.2: https://stdgems.org/2.7.0/

• Replaces !2541 (closed)

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com