chore: bump net.coobird:thumbnailator from 0.4.17 to 0.4.20

Bumps [net.coobird:thumbnailator](https://github.com/coobird/thumbnailator) from 0.4.17 to 0.4.20.
- [Commits](coobird/thumbnailator@0.4.17...0.4.20)

---
updated-dependencies:
- dependency-name: net.coobird:thumbnailator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -687,7 +687,7 @@
 		<start-class>ru.mystamps.web.support.spring.boot.ApplicationBootstrap</start-class>
 
 		<surefire.plugin.version>2.22.0</surefire.plugin.version>
-		<thumbnailator.version>0.4.17</thumbnailator.version>
+		<thumbnailator.version>0.4.20</thumbnailator.version>
 
 		<!-- Redefine default value from spring-boot-dependencies -->
 		<thymeleaf-extras-springsecurity.version>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>