chore: update azul/zulu-openjdk Docker tag to v21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
azul/zulu-openjdk	final	major	17-jre-headless -> 21.0.3-jre-headless
azul/zulu-openjdk	stage	major	17-jre-headless -> 21.0.3-jre-headless

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[github-actions]

Test Results

 47 files  ±0   47 suites  ±0   1m 36s ⏱️ +8s
395 tests ±0  395 ✅ ±0  0 💤 ±0  0 ❌ ±0 
726 runs  ±0  726 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit e406d17. ± Comparison against base commit 3e59415.

This pull request removes 28 and adds 28 tests. Note that renamed tests count towards both.

eu.cloudnetservice.driver.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"this":"is","hello":"world","insane":"!"}}, PRETTY
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [10] 23967, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [1] {test=test1, test2=test3}, class java.lang.String, class java.lang.String
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [23] 2024-04-30T16:32:20.774212185Z
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [24] 2024-04-30T16:24:00.774216353Z
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [2] XR0PG9HU2WB39113D5YO5WZSG, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [2] {test=123, test2=456}, class java.lang.String, class java.lang.Integer
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [38] 2024-04-30
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [3] -2075990072, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [3] Lobbyhello156:39e282e6-7c59-4201-b6ae-2b004b744d3d
…

eu.cloudnetservice.driver.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"hello":"world","insane":"!","this":"is"}}, PRETTY
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [10] 23347, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [1] {test2=test3, test=test1}, class java.lang.String, class java.lang.String
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [23] 2024-05-16T14:07:25.294582919Z
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [24] 2024-05-16T13:59:05.294587507Z
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [2] WHSKN2E021VAISRX7XJR3HKA3, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [2] {test2=456, test=123}, class java.lang.String, class java.lang.Integer
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [38] 2024-05-16
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [3] 1463582345, null
eu.cloudnetservice.driver.network.rpc.object.DefaultObjectMapperTest ‑ [3] Lobbyhello156:d80a5d73-854b-4d81-862a-1abb619df3f4
…

♻️ This comment has been updated with latest results.

[derklaro]

Blocked until we update everything to use Java 21 (and Gradle does support compiling on it)

[renovate]

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