Remove unnecessary ProcessHandle related reflection now that we moved to Java 11

[geoand]

No description provided.

[quarkus-bot]

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Failing Jobs - Building b951d7b

Status	Name	Step	Test failures	Logs	Raw logs
⌛	Initial JDK 11 Build	Reclaim Disk Space	⚠️ Check →	Logs	Raw logs
🚫	Devtools Tests - JDK ${{ matrix.java.name }}
🚫	Devtools Tests - JDK 11 Windows
🚫	Gradle Tests - JDK 11 ${{ matrix.os.family }}
🚫	JVM Tests - JDK ${{ matrix.java.name }}
🚫	JVM Tests - JDK 11 Windows
🚫	Maven Tests - JDK ${{ matrix.java.name }}
🚫	Maven Tests - JDK 11 Windows
🚫	MicroProfile TCKs Tests
🚫	Native Tests - ${{ matrix.category }}
🚫	Native Tests - Windows - ${{ matrix.category }}

[gastaldi]

LGTM

[quarkus-bot]

Failing Jobs - Building 29727c4

Status	Name	Step	Test failures	Logs	Raw logs
⌛	Native Tests - gRPC	Build	⚠️ Check →	Logs	Raw logs