Update slf4j dependency to 1.7.26
<lucene.version>4.7.1</lucene.version>
<solr.version>5.5.5</solr.version>
<mongo.driver.version>3.8.2</mongo.driver.version>
- <slf4j.api.version>1.7.25</slf4j.api.version>
- <slf4j.version>1.7.25</slf4j.version> <!-- sync with logback version -->
+ <slf4j.api.version>1.7.26</slf4j.api.version>
+ <slf4j.version>1.7.26</slf4j.version> <!-- sync with logback version -->
<logback.version>1.2.3</logback.version>
<h2.version>1.4.194</h2.version>
<tika.version>1.20</tika.version>
