Bump slf4j.version from 2.0.18 to 2.0.20 (#1648)

Bumps `slf4j.version` from 2.0.18 to 2.0.20.

Updates `org.slf4j:jcl-over-slf4j` from 2.0.18 to 2.0.20

Updates `org.slf4j:slf4j-api` from 2.0.18 to 2.0.20

Updates `org.slf4j:slf4j-log4j12` from 2.0.18 to 2.0.20

Updates `org.slf4j:jul-to-slf4j` from 2.0.18 to 2.0.20

Updates `org.slf4j:slf4j-simple` from 2.0.18 to 2.0.20

---
updated-dependencies:
- dependency-name: org.slf4j:jcl-over-slf4j
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:slf4j-api
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:slf4j-log4j12
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:jul-to-slf4j
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:slf4j-simple
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -288,7 +288,7 @@
 		<jetty.version>9.4.58.v20250814</jetty.version>
 		<sf-jung.version>2.1.1</sf-jung.version>
 		<shiro.version>1.13.0</shiro.version>
-		<slf4j.version>2.0.18</slf4j.version>
+		<slf4j.version>2.0.20</slf4j.version>
 		<logback.version>1.3.16</logback.version>
 		<log4j.version>2.26.1</log4j.version>
 		<spring.version>4.3.30.RELEASE</spring.version>