add upper pin for asdf

[braingram]

Changes

asdf is preparing to make a 4.0.0 release. It contains a few breaking changes that will impact weldx. The major ones are:

• removal of deprecated imports (like asdf.asdf)
• switching to ASDF standard 1.6.0 as the default version when writing files

See #910 for changes that should make weldx 4.x compatible.

This PR is an alternative which pins asdf to "<4".

Related Issues

Checks

• updated CHANGELOG.md
• updated tests/
• updated doc/
• update example/tutorial notebooks
• update manifest file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.16%. Comparing base (5ad2929) to head (34c0d78).
Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #952      +/-   ##
==========================================
- Coverage   96.48%   96.16%   -0.33%     
==========================================
  Files          95       95              
  Lines        6293     6340      +47     
==========================================
+ Hits         6072     6097      +25     
- Misses        221      243      +22     

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[github-actions]

Test Results

2 188 tests  ±0   2 187 ✅ ±0   1m 59s ⏱️ -6s
    1 suites ±0       1 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 34c0d78. ± Comparison against base commit 910973a.

[CagtayFabry]

Thank you @braingram , I will keep this pin for now until the next major release