Bump spring.version in /bom-dependencies (#796)

Bumps `spring.version` from 4.3.10.RELEASE_1 to 5.2.7.RELEASE_1.

Updates `org.apache.servicemix.bundles.spring-core` from 4.3.10.RELEASE_1 to 5.2.7.RELEASE_1

Updates `org.apache.servicemix.bundles.spring-context` from 4.3.10.RELEASE_1 to 5.2.7.RELEASE_1

Updates `org.apache.servicemix.bundles.spring-beans` from 4.3.10.RELEASE_1 to 5.2.7.RELEASE_1

Updates `spring-core` from 4.3.10.RELEASE to 5.2.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.10.RELEASE...v5.2.7.RELEASE)

Updates `spring-context` from 4.3.10.RELEASE to 5.2.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.10.RELEASE...v5.2.7.RELEASE)

Updates `spring-test` from 4.3.10.RELEASE to 5.2.7.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v4.3.10.RELEASE...v5.2.7.RELEASE)

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Author: dependabot[bot]

bom-dependencies/pom.xml

@@ -58,7 +58,7 @@
         <osgi.version>6.0.0</osgi.version>
         <slf4j.version>1.7.25</slf4j.version>
         <spring-boot.version>1.5.8.RELEASE</spring-boot.version>
-        <spring.version>4.3.10.RELEASE</spring.version>
+        <spring.version>5.2.7.RELEASE</spring.version>
         <woodstox-core-asl.version>4.4.1</woodstox-core-asl.version>
     </properties>
 
@@ -190,17 +190,17 @@
             <dependency>
                 <groupId>org.apache.servicemix.bundles</groupId>
                 <artifactId>org.apache.servicemix.bundles.spring-core</artifactId>
-                <version>${spring.version}_1</version>
+                <version>${spring.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.apache.servicemix.bundles</groupId>
                 <artifactId>org.apache.servicemix.bundles.spring-context</artifactId>
-                <version>${spring.version}_1</version>
+                <version>${spring.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.apache.servicemix.bundles</groupId>
                 <artifactId>org.apache.servicemix.bundles.spring-beans</artifactId>
-                <version>${spring.version}_1</version>
+                <version>${spring.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.osgi</groupId>