Bump log4j.version from 2.20.0 to 2.21.1 in /full (closes #691)

Bumps `log4j.version` from 2.20.0 to 2.21.1.

Updates `org.apache.logging.log4j:log4j-api` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-core` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-slf4j2-impl` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-jul` from 2.20.0 to 2.21.1

Change-Id: Id5669e89daf060f5a12a8140688e92b31e568d69

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-slf4j2-impl
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-jul
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Change-Id: I2bf3dd9ba679cb8e0cf7bdb22ef1addb41caaaae
diff --git a/full/pom.xml b/full/pom.xml
index d0edf82..7e91d33 100644
--- a/full/pom.xml
+++ b/full/pom.xml
@@ -13,7 +13,7 @@
 		<spring.version>6.0.11</spring.version>
 		<jetty.version>11.0.15</jetty.version>
 		<flyway.version>9.21.1</flyway.version>
-		<log4j.version>2.20.0</log4j.version>
+		<log4j.version>2.21.1</log4j.version>
 		<krill.version>[0.61.3,)</krill.version>
 		<koral.version>[0.41,)</koral.version>
 	</properties>