Bump spring.version from 5.3.7 to 5.3.8

Bumps `spring.version` from 5.3.7 to 5.3.8.

Updates `spring-core` from 5.3.7 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.7...v5.3.8)

Updates `spring-beans` from 5.3.7 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.7...v5.3.8)

Updates `spring-context` from 5.3.7 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.7...v5.3.8)

Updates `spring-web` from 5.3.7 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.7...v5.3.8)

Updates `spring-test` from 5.3.7 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.3.7...v5.3.8)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-beans
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-context
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-web
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-test
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 9aae313..7731502 100644
--- a/pom.xml
+++ b/pom.xml
@@ -520,7 +520,7 @@
         <plexus.utils.version>3.3.0</plexus.utils.version>
         <rhino.version>1.6R7</rhino.version>
         <slf4j.version>1.7.30</slf4j.version>
-        <spring.version>5.3.7</spring.version>
+        <spring.version>5.3.8</spring.version>
         <wsdl4j.version>1.6.3</wsdl4j.version>
         <xalan.version>2.7.2</xalan.version>
         <xmlbeans.version>3.0.1</xmlbeans.version>