Upgrade to Thymeleaf 3.1.1.RELEASE

Closes gh-33486

build.gradle

@@ -26,12 +26,8 @@ allprojects {
 
 	repositories {
 		mavenCentral()
-		maven {
+		if (version.contains('-')) {
-			url "https://repo.spring.io/milestone"
+			maven { url "https://repo.spring.io/milestone" }
-			content {
-				// Thymeleaf uses 6.0.0-RC2 of Security's bom in its dependency management
-				includeModule("org.springframework.security", "spring-security-bom")
-			}
 		}
 		if (version.endsWith('-SNAPSHOT')) {
 			maven { url "https://repo.spring.io/snapshot" }

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

@@ -1451,7 +1451,7 @@ bom {
 			]
 		}
 	}
-	library("Thymeleaf", "3.1.0.RELEASE") {
+	library("Thymeleaf", "3.1.1.RELEASE") {
 		group("org.thymeleaf") {
 			modules = [
 				"thymeleaf",