Change version to 0.9.5dev0

[rflamary]

Types of changes

This PR changes the version to 0.9.5dev0 now that release 0.9.4 has been published.

Motivation and context / Related issue

How has this been tested (if it applies)

PR checklist

• I have read the CONTRIBUTING document.
• The documentation is up-to-date with the changes I made (check build artifacts).
• All tests passed, and additional code has been covered with new tests.
• I have added the PR and Issue fix to the RELEASES.md file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.66%. Comparing base (2987765) to head (3b5e975).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #647   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          85       85           
  Lines       16934    16934           
=======================================
  Hits        16370    16370           
  Misses        564      564