Upgrade to Jakarta Mail 2.1 and switch to Eclipse Angus RI

Closes gh-33059
Closes gh-33050

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -14,6 +14,21 @@ bom {
 			issueLabels = ["type: dependency-upgrade"]
 		}
 	}
+	library("Angus Mail", "1.0.0") {
+		group("org.eclipse.angus") {
+			modules = [
+				"angus-core",
+				"angus-mail",
+				"angus-dsn",
+				"angus-gimap",
+				"angus-imap",
+				"jakarta.mail",
+				"logging-mailhandler",
+				"pop3",
+				"smtp"
+			]
+		}
+	}
 	library("Artemis", "2.26.0") {
 		group("org.apache.activemq") {
 			modules = [
@@ -505,10 +520,7 @@ bom {
 			]
 		}
 	}
-	library("Jakarta Mail", "2.0.1") {
-		prohibit("[2.1.0-RC1,)") {
-			because "it exceeds our Jakarta EE 9 baseline"
-		}
+	library("Jakarta Mail", "2.1.0") {
 		group("jakarta.mail") {
 			modules = [
 				"jakarta.mail-api"
@@ -1489,13 +1501,6 @@ bom {
 			]
 		}
 	}
-	library("Sun Mail", "2.0.1") {
-		group("com.sun.mail") {
-			modules = [
-				"jakarta.mail"
-			]
-		}
-	}
 	library("Thymeleaf", "3.1.0.RC1") {
 		group("org.thymeleaf") {
 			modules = [