misc: Updated resources bucket url to version 20

This will fix this v20.0.0.0 of gem5 to the v20 gem5 resources bucket
subdirectory.

Change-Id: I0c1f1a2c28c18e684bcb009d1650f9e9d2950a93
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28708
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed