Add deprecated LogFactory.getInstance() to smooth upgrade to 4.x

[nvoxland]

Fixes #1641

[codecov]

Codecov Report

Merging #1642 (71b3498) into 4.3.x (78675c1) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##              4.3.x    #1642      +/-   ##
============================================
- Coverage     49.59%   49.59%   -0.01%     
- Complexity     7883     7884       +1     
============================================
  Files           759      759              
  Lines         37152    37153       +1     
  Branches       6727     6727              
============================================
  Hits          18426    18426              
  Misses        16270    16270              
- Partials       2456     2457       +1     

Impacted Files	Coverage Δ	Complexity Δ
...re/src/main/java/liquibase/logging/LogFactory.java	20.00% <100.00%> (+20.00%)	1.00 <1.00> (+1.00)
...e/src/main/java/liquibase/util/DependencyUtil.java	91.22% <0.00%> (-0.88%)	0.00% <0.00%> (ø%)

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[molivasdat]

Looks fine.