Upgrade to Sendgrid 4.4.5

Closes gh-20268

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/sendgrid/SendGridAutoConfigurationTests.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,7 +52,7 @@ class SendGridAutoConfigurationTests {
 	void expectedSendGridBeanCreatedApiKey() {
 		loadContext("spring.sendgrid.api-key:SG.SECRET-API-KEY");
 		SendGrid sendGrid = this.context.getBean(SendGrid.class);
-		assertThat(sendGrid).extracting("apiKey").isEqualTo("SG.SECRET-API-KEY");
+		assertThat(sendGrid.getRequestHeaders().get("Authorization")).isEqualTo("Bearer SG.SECRET-API-KEY");
 	}
 
 	@Test
@@ -66,7 +66,7 @@ class SendGridAutoConfigurationTests {
 	void autoConfigurationNotFiredWhenBeanAlreadyCreated() {
 		loadContext(ManualSendGridConfiguration.class, "spring.sendgrid.api-key:SG.SECRET-API-KEY");
 		SendGrid sendGrid = this.context.getBean(SendGrid.class);
-		assertThat(sendGrid).extracting("apiKey").isEqualTo("SG.CUSTOM_API_KEY");
+		assertThat(sendGrid.getRequestHeaders().get("Authorization")).isEqualTo("Bearer SG.CUSTOM_API_KEY");
 	}
 
 	@Test

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -180,7 +180,7 @@
 		<rxjava2.version>2.2.17</rxjava2.version>
 		<selenium.version>3.141.59</selenium.version>
 		<selenium-htmlunit.version>2.36.0</selenium-htmlunit.version>
-		<sendgrid.version>4.4.1</sendgrid.version>
+		<sendgrid.version>4.4.5</sendgrid.version>
 		<servlet-api.version>4.0.1</servlet-api.version>
 		<slf4j.version>1.7.30</slf4j.version>
 		<snakeyaml.version>1.25</snakeyaml.version>