Bump spring.version from 5.3.6 to 5.3.8

Bumps `spring.version` from 5.3.6 to 5.3.8.

Updates `spring-core` from 5.3.6 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.6...v5.3.8)

Updates `spring-beans` from 5.3.6 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.6...v5.3.8)

Updates `spring-web` from 5.3.6 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.6...v5.3.8)

Updates `spring-context` from 5.3.6 to 5.3.8
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.6...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-web
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-context
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -51,7 +51,7 @@
         <httpcore.version>4.4.14</httpcore.version>
         <jackson.version>2.12.3</jackson.version>
         <slf4j.version>1.7.30</slf4j.version>
-        <spring.version>5.3.6</spring.version>
+        <spring.version>5.3.8</spring.version>
         <jadler.version>1.3.0</jadler.version>
         <json-unit.version>2.25.0</json-unit.version>
         <surefire.version>2.22.2</surefire.version>