Polish dependency management for OIDC starter

See gh-13830

Author: snicoll

spring-boot-project/spring-boot-starters/spring-boot-starter-oauth2-oidc-client/pom.xml

@@ -29,6 +29,12 @@
 		<dependency>
 			<groupId>org.springframework.security</groupId>
 			<artifactId>spring-security-oauth2-client</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>javax.mail</groupId>
+					<artifactId>javax.mail-api</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.security</groupId>