Temporary fix to z3-solver dependency issues

[whyitfor]

• [x] I have reviewed the OFRAK contributor guide and attest that this pull request is in accordance with it.

One sentence summary of this PR (This should go in the CHANGELOG!) Add importlib-resources as an ofrak-angr dependency as a workaround #398.

Link to Related Issue(s) See #398.

Please describe the changes in your request. See above.

Anyone you think should look at this, specifically? @rbs-jacob