fix typo in dependencies.properties.

Author: zhumin8

gax-java/dependencies.properties

@@ -76,7 +76,7 @@ maven.com_google_http_client_google_http_client_gson=com.google.http-client:goog
 maven.org_codehaus_mojo_animal_sniffer_annotations=org.codehaus.mojo:animal-sniffer-annotations:1.24
 maven.javax_annotation_javax_annotation_api=javax.annotation:javax.annotation-api:1.3.2
 maven.org_graalvm_sdk=org.graalvm.sdk:graal-sdk:22.3.5
-maven_org_slf4j_slf4j_api=org.slf4j:slf4j-api:2.0.16
+maven.org_slf4j_slf4j_api=org.slf4j:slf4j-api:2.0.16
 
 # Testing maven artifacts
 maven.junit_junit=junit:junit:4.13.2