fix: samples/server/petstore/jaxrs/jersey1/pom.xml to reduce vulnerab…

…ilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-LOG4J-572732

samples/server/petstore/jaxrs/jersey1/pom.xml

@@ -201,7 +201,7 @@
     <jetty-version>9.2.9.v20150224</jetty-version>
     <jersey-version>1.19.1</jersey-version>
     <jackson-version>2.9.9</jackson-version>
-    <slf4j-version>1.7.21</slf4j-version>
+    <slf4j-version>1.7.29</slf4j-version>
     <junit-version>4.13</junit-version>
     <servlet-api-version>2.5</servlet-api-version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>