Bump spring-boot.version from 2.4.1 to 2.4.2 (#933)

Bumps `spring-boot.version` from 2.4.1 to 2.4.2.

Updates `spring-boot-starter-web` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Updates `spring-boot-starter-undertow` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Updates `spring-boot-starter-test` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Updates `spring-boot-autoconfigure` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Updates `spring-boot-configuration-processor` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

Updates `spring-boot-starter` from 2.4.1 to 2.4.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.2)

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logbook-spring-boot-webflux-autoconfigure/pom.xml

@@ -17,7 +17,7 @@
             v2 so we have to prevent testing this module against 4-th spring -->
             <properties>
                 <spring.version>${spring5.version}</spring.version>
-                <spring-boot.version>${spring-boot2.version}</spring-boot.version>
+                <spring-boot.version>2.4.2</spring-boot.version>
                 <spring-security.version>${spring-security5.version}</spring-security.version>
             </properties>
         </profile>

pom.xml

@@ -86,7 +86,7 @@
         <spring-security5.version>5.4.2</spring-security5.version>
 
         <spring.version>5.3.3</spring.version>
-        <spring-boot.version>${spring-boot2.version}</spring-boot.version>
+        <spring-boot.version>2.4.2</spring-boot.version>
         <spring-security.version>${spring-security5.version}</spring-security.version>
 
         <junit.version>5.7.0</junit.version>