Remove Spring Security BOM

Temporarily remove the Spring Security BOM import as version numbers
for the imported projects don't automatically get resolved by the
gradle plugin.

See gh-838

spring-boot-dependencies/pom.xml

@@ -990,10 +990,58 @@
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.security</groupId>
-				<artifactId>spring-security-bom</artifactId>
+				<artifactId>spring-security-acl</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-aspects</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-cas</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-config</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-core</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-crypto</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-ldap</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-openid</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-remoting</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-taglibs</artifactId>
+				<version>${spring-security.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework.security</groupId>
+				<artifactId>spring-security-web</artifactId>
 				<version>${spring-security.version}</version>
-				<scope>import</scope>
-				<type>pom</type>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.security</groupId>