Align server.tomcat.max-part-count default with Tomcat's default

Fixes gh-49311

module/spring-boot-tomcat/src/main/java/org/springframework/boot/tomcat/autoconfigure/TomcatServerProperties.java

@@ -88,7 +88,7 @@ public class TomcatServerProperties {
 	 * Maximum total number of parts permitted in a multipart/form-data request. Requests
 	 * that exceed this limit will be rejected. A value of less than 0 means no limit.
 	 */
-	private int maxPartCount = 10;
+	private int maxPartCount = 50;
 
 	/**
 	 * Maximum amount of request body to swallow.

module/spring-boot-tomcat/src/test/java/org/springframework/boot/tomcat/autoconfigure/TomcatServerPropertiesTests.java

@@ -194,6 +194,17 @@ class TomcatServerPropertiesTests {
 			.isEqualTo(getDefaultConnector().getMaxPostSize());
 	}
 
+	@Test
+	void tomcatMaxPartCountMatchesConnectorDefault() {
+		assertThat(this.properties.getMaxPartCount()).isEqualTo(getDefaultConnector().getMaxPartCount());
+	}
+
+	@Test
+	void tomcatMaxPartHeaderSizeMatchesConnectorDefault() {
+		assertThat(this.properties.getMaxPartHeaderSize().toBytes())
+			.isEqualTo(getDefaultConnector().getMaxPartHeaderSize());
+	}
+
 	@Test
 	void tomcatUriEncodingMatchesConnectorDefault() {
 		assertThat(this.properties.getUriEncoding().name()).isEqualTo(getDefaultConnector().getURIEncoding());

module/spring-boot-tomcat/src/test/java/org/springframework/boot/tomcat/autoconfigure/TomcatWebServerFactoryCustomizerTests.java

@@ -190,7 +190,7 @@ class TomcatWebServerFactoryCustomizerTests {
 	@Test
 	void defaultMaxPartCount() {
 		customizeAndRunServer(
-				(server) -> assertThat(server.getTomcat().getConnector().getMaxPartCount()).isEqualTo(10));
+				(server) -> assertThat(server.getTomcat().getConnector().getMaxPartCount()).isEqualTo(50));
 	}
 
 	@Test