Handle minor dependency updates separately from major

[zakpatterson]

Dependabot tried to update eslint 7-8, react 16-17, react-router 5-6, react-scripts 4-5, and all of these are not working together or not working with some of our other dependencies (see #786, #789). This splits out the working minor version updates.

Also, the dependabot config is updated so minor version updates should go to dependabot-updates as usual, but major version updates go to a different branch dependabot-updates-major.

[codecov]

Codecov Report

Merging #790 (a26b60b) into master (1668ddc) will increase coverage by 0.93%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #790      +/-   ##
==========================================
+ Coverage   69.96%   70.89%   +0.93%     
==========================================
  Files         116      116              
  Lines        3815     3835      +20     
  Branches      595      615      +20     
==========================================
+ Hits         2669     2719      +50     
+ Misses       1132     1102      -30     
  Partials       14       14              

Impacted Files	Coverage Δ
src/irsForms/worksheets/ChildTaxCreditWorksheet.ts	97.67% <0.00%> (-2.33%)	⬇️
src/irsForms/ScheduleD.ts	95.00% <0.00%> (-0.96%)	⬇️
src/pdfFiller/pdfHandler.ts	30.00% <0.00%> (-0.77%)	⬇️
src/components/Summary.tsx	9.09% <0.00%> (-0.59%)	⬇️
src/components/createPDF.tsx	3.12% <0.00%> (-0.11%)	⬇️
src/serviceWorker.js	0.00% <0.00%> (ø)
src/pdfFiller/Fill.ts	100.00% <0.00%> (ø)
src/irsForms/worksheets/SocialSecurityBenefits.ts	0.00% <0.00%> (ø)
src/components/FormContainer.tsx	94.73% <0.00%> (+0.07%)	⬆️
src/tests/common/LocalForms.ts	93.33% <0.00%> (+0.47%)	⬆️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1668ddc...a26b60b. Read the comment docs.