v0.4.6 Minor fixes and improvements

• Fix to installation script: missing sudo to remove old library, not observing the GOPJRT_NOSUDO request.
• Fixed github test action go.yaml.
• Explicitly set the random algorithm to Philox when using RngBitGenerator. Also improved documentation and added
  check on the validity of the random state shape.
• Added dtype.DType.IsUnsigned()