Bump ch.qos.logback:logback-classic from 1.4.1 to 1.4.8

[dependabot[bot]]

Bumps ch.qos.logback:logback-classic from 1.4.1 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
• Additional commits viewable in compare view

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