Bump tools.logging dependency version

The old version was causing reflection warnings, 0.2.6 fixes them.

> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isTraceEnabled can't be resolved.
> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isDebugEnabled can't be resolved.
> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isInfoEnabled can't be resolved.
> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isWarnEnabled can't be resolved.
> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isErrorEnabled can't be resolved.
> Reflection warning, clojure/tools/logging.clj:270:1 - reference to field isErrorEnabled can't be resolved.