Update main branch to start work on 2.7.x

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/test/resources/dependencies-layer-no-filter.xml

@@ -1,7 +1,7 @@
 <layers xmlns="http://www.springframework.org/schema/boot/layers"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://www.springframework.org/schema/boot/layers
-					  https://www.springframework.org/schema/boot/layers/layers-2.6.xsd">
+					  https://www.springframework.org/schema/boot/layers/layers-2.7.xsd">
 	<dependencies>
 		<into layer="my-deps" />
 	</dependencies>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/test/resources/layers.xml

@@ -1,7 +1,7 @@
 <layers xmlns="http://www.springframework.org/schema/boot/layers"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://www.springframework.org/schema/boot/layers
-					  https://www.springframework.org/schema/boot/layers/layers-2.6.xsd">
+					  https://www.springframework.org/schema/boot/layers/layers-2.7.xsd">
 	<application>
 		<into layer="my-resources">
 			<include>META-INF/resources/**</include>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/test/resources/resource-layer-no-filter.xml

@@ -1,7 +1,7 @@
 <layers xmlns="http://www.springframework.org/schema/boot/layers"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://www.springframework.org/schema/boot/layers
-					  https://www.springframework.org/schema/boot/layers/layers-2.6.xsd">
+					  https://www.springframework.org/schema/boot/layers/layers-2.7.xsd">
 	<application>
 		<into layer="my-layer" />
 	</application>