build(deps): Bump logback-classic from 1.4.7 to 1.4.8

Bumps logback-classic from 1.4.7 to 1.4.8.

Commits

60f4910 prepare release 1.4.8
ca7fbc7 link logbackMDCAdapter in LoggerContext, fixes LOGBACK-1742
9e833ec ongoing work on JsonEncoder LOGBACK-1734
97e5175 ongoing work on JsonEnconder
f7ae802 fix LOGBACK-1737
f93f3bb remove older JsonEncoder
22da156 ongoing work on JsonEscapeUtil
b8e0936 add constant to restore text attributes
ec508c4 [LOGBACK-1736] Make OSGi S.L.M. requirement for Configurator optional
a61d8c4 Update README.md
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extenda / structurizr-to-png

build(deps): Bump logback-classic from 1.4.7 to 1.4.8 #58