Bump slf4j.version from 1.7.26 to 1.7.28

Bumps `slf4j.version` from 1.7.26 to 1.7.28.

Updates `slf4j-api` from 1.7.26 to 1.7.28
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.7.26...v_1.7.28)

Updates `slf4j-log4j12` from 1.7.26 to 1.7.28
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.7.26...v_1.7.28)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

pom.xml

@@ -77,7 +77,7 @@
         <prometheus.metrics.version>0.6.0</prometheus.metrics.version>
         <guava.version>23.0</guava.version>
         <snakeyaml.version>1.24</snakeyaml.version>
-        <slf4j.version>1.7.16</slf4j.version>
+        <slf4j.version>1.7.28</slf4j.version>
         <junit.version>4.12</junit.version>
     </properties>
     <dependencyManagement>