Remove explicit snakeyaml dependency (#683)

Rely on the transitive dependency from the Jackson dataformat library.

Commit 6239603 added the dependency in
order to assure that we were including the most recent release of the
snakeyaml jar file.  The Jackson dataformat library version that we are
using already depends on the most recent snakeyaml release, so we no
longer need this explicit dependency.

Reverts 6239603

Author: MarkEWaite

plugin-management-library/pom.xml

@@ -65,12 +65,6 @@
             <artifactId>jackson-dataformat-yaml</artifactId>
             <version>2.17.1</version>
         </dependency>
-        <!-- TODO: Remove when jackson dataformat snakeyaml dependency is at least 1.32 -->
-        <dependency>
-            <groupId>org.yaml</groupId>
-            <artifactId>snakeyaml</artifactId>
-            <version>2.2</version>
-        </dependency>
         <dependency>
             <groupId>com.github.spotbugs</groupId>
             <artifactId>spotbugs-annotations</artifactId>