Updated build and dependencies:

[tfenne]

• Scala 2.13 only (and updated to 2.13.8)
• Updated to sbt 1.6.2
• Updated sbt plugins to match
• Updated various dependencies

[tfenne]

@nh13 You don't actually have to review this, it's basically a patch to make dagr work with common ~1.4. I'm going to merge tomorrow and then cut a release unless I hear from you that you strongly object.

[codecov-commenter]

Codecov Report

Merging #402 (c9397e1) into master (a27e576) will increase coverage by 0.51%. The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
+ Coverage   91.40%   91.92%   +0.51%     
==========================================
  Files          31       31              
  Lines        1187     1164      -23     
  Branches       77       80       +3     
==========================================
- Hits         1085     1070      -15     
+ Misses        102       94       -8     

Flag	Coverage Δ
unittests	91.92% <70.58%> (+0.51%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...in/scala/dagr/core/cmdline/DagrScriptManager.scala	84.84% <68.75%> (+8.48%)	:arrow_up:
...rc/main/scala/dagr/core/cmdline/DagrCoreMain.scala	82.41% <100.00%> (-0.20%)	:arrow_down:

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