chore(deps): bump spring-boot.version from 2.6.3 to 2.6.4 (#972)

Bumps `spring-boot.version` from 2.6.3 to 2.6.4.

Updates `spring-boot-dependencies` from 2.6.3 to 2.6.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.3...v2.6.4)

Updates `spring-boot-maven-plugin` from 2.6.3 to 2.6.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -53,7 +53,7 @@
         <javapoet.version>1.13.0</javapoet.version>
         <assertj.version>3.22.0</assertj.version>
         <awaitility.version>4.1.1</awaitility.version>
-        <spring-boot.version>2.6.3</spring-boot.version>
+        <spring-boot.version>2.6.4</spring-boot.version>
         <micrometer-core.version>1.8.3</micrometer-core.version>
 
         <fmt-maven-plugin.version>2.11</fmt-maven-plugin.version>