Update OLS URLs to OLS4 (#1153)

Author: twalsh-ebi

conf/SiteDefs.pm

@@ -232,9 +232,9 @@ our $ENSEMBL_JAVA         = "java"; # For js/css minification
 
 ## REST services used by e.g. ConfigPacker
 
-our $OLS_REST_API          = 'https://www.ebi.ac.uk/ols/api/';
+our $OLS_REST_API          = 'https://www.ebi.ac.uk/ols4/api/';
 our $ENSEMBL_GLOSSARY_REST = $OLS_REST_API.'ontologies/ensemblglossary';
-our $ENSEMBL_GLOSSARY_URL  = 'https://www.ebi.ac.uk/ols/ontologies/ensemblglossary';
+our $ENSEMBL_GLOSSARY_URL  = 'https://www.ebi.ac.uk/ols4/ontologies/ensemblglossary';
 # Molecular interaction REST API
 our $MOLECULAR_INTERACTIONS_URL = 'https://interactions.rest.ensembl.org';