Upgrade to Reactor 2020.0.38 and Netty 4.1.101

Includes RxJava 3.1.8, SmallRye Mutiny 1.9.0, BlockHound 1.0.8, OpenPDF 1.3.33, Checkstyle 10.12.5

Closes gh-31584

build.gradle

@@ -28,8 +28,8 @@ configure(allprojects) { project ->
 	dependencyManagement {
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.7"
-			mavenBom "io.netty:netty-bom:4.1.100.Final"
-			mavenBom "io.projectreactor:reactor-bom:2020.0.37"
+			mavenBom "io.netty:netty-bom:4.1.101.Final"
+			mavenBom "io.projectreactor:reactor-bom:2020.0.38"
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR13"
 			mavenBom "io.rsocket:rsocket-bom:1.1.3"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.53.v20231009"
@@ -67,9 +67,9 @@ configure(allprojects) { project ->
 			dependency "io.reactivex:rxjava:1.3.8"
 			dependency "io.reactivex:rxjava-reactive-streams:1.2.1"
 			dependency "io.reactivex.rxjava2:rxjava:2.2.21"
-			dependency "io.reactivex.rxjava3:rxjava:3.1.5"
-			dependency "io.smallrye.reactive:mutiny:1.8.0"
-			dependency "io.projectreactor.tools:blockhound:1.0.6.RELEASE"
+			dependency "io.reactivex.rxjava3:rxjava:3.1.8"
+			dependency "io.smallrye.reactive:mutiny:1.9.0"
+			dependency "io.projectreactor.tools:blockhound:1.0.8.RELEASE"
 
 			dependency "com.caucho:hessian:4.0.63"
 			dependency "com.fasterxml:aalto-xml:1.3.1"
@@ -96,7 +96,7 @@ configure(allprojects) { project ->
 
 			dependency "com.h2database:h2:2.1.214"
 			dependency "com.github.ben-manes.caffeine:caffeine:2.9.3"
-			dependency "com.github.librepdf:openpdf:1.3.30"
+			dependency "com.github.librepdf:openpdf:1.3.33"
 			dependency "com.rometools:rome:1.18.0"
 			dependency "commons-io:commons-io:2.5"
 			dependency "io.vavr:vavr:0.10.4"
@@ -340,7 +340,7 @@ configure([rootProject] + javaProjects) { project ->
 	}
 
 	checkstyle {
-		toolVersion = "10.12.1"
+		toolVersion = "10.12.5"
 		configDirectory.set(rootProject.file("src/checkstyle"))
 	}