Update logback-classic only on 1.3.x series that supports JDK 8

[exoego]

Supersedes #2719

logback-classic no longer supports JDK 8 starting from 1.4.0.

Let's pin it to 1.3.x series until we drop JDK 8 support.

[codecov]

Codecov Report

Base: 80.54% // Head: 80.62% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (68ee22b) compared to base (6fadfce).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2745      +/-   ##
==========================================
+ Coverage   80.54%   80.62%   +0.07%     
==========================================
  Files         146      147       +1     
  Lines        2709     2740      +31     
  Branches      168      176       +8     
==========================================
+ Hits         2182     2209      +27     
- Misses        527      531       +4     

Impacted Files	Coverage Δ
...la/org/scalasteward/core/application/Context.scala	68.00% <0.00%> (-2.59%)	⬇️
...org/scalasteward/core/application/StewardAlg.scala	42.42% <0.00%> (-1.70%)	⬇️
.../scala/org/scalasteward/core/application/Cli.scala	100.00% <0.00%> (ø)
...teward/core/repoconfig/ValidateRepoConfigAlg.scala	100.00% <0.00%> (ø)

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[alejandrohdezma]

LGTM. Just curious, what's holding us back from dropping support for JDK 8?

[exoego]

Good question.
Actually I do not know.

Since Scala Steward is an app and not a library to be used in "enterprise" app, it might be easy for users, who hosted their own Steward, to run Steward on Java 11.

[exoego]

I've opened #2746 to consider dropping Java 8