Bump logback-classic from 1.2.1 to 1.2.3 (#733)

Bumps logback-classic from 1.2.1 to 1.2.3.

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

uhabits-server/build.gradle.kts

@@ -35,7 +35,7 @@ application {
 dependencies {
     val ktorVersion = "1.4.1"
     val kotlinVersion = "1.4.21"
-    val logbackVersion = "1.2.1"
+    val logbackVersion = "1.2.3"
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion")
     implementation("io.ktor:ktor-server-netty:$ktorVersion")
     implementation("ch.qos.logback:logback-classic:$logbackVersion")