[MCHANGES-428] Use HttpClient in RestJiraDownloader #226

Job	Run time
Verify / ubuntu-latest jdk-17-zulu 3.9.9	2m 44s
Verify / setup-matrix	1s
Verify / ubuntu-latest jdk-17-zulu 3.6.3	1m 20s
Verify / ubuntu-latest jdk-17-zulu 3.9.9	3s
Verify / ubuntu-latest jdk-21-zulu 3.6.3	1m 18s
Verify / ubuntu-latest jdk-21-zulu 3.9.9	1m 22s
Verify / ubuntu-latest jdk-8-zulu 3.6.3	1m 8s
Verify / ubuntu-latest jdk-8-zulu 3.9.9	1m 13s
Verify / windows-latest jdk-17-zulu 3.6.3	2m 7s
Verify / windows-latest jdk-17-zulu 3.9.9	2m 26s
Verify / windows-latest jdk-21-zulu 3.6.3	2m 6s
Verify / windows-latest jdk-21-zulu 3.9.9	2m 18s
Verify / windows-latest jdk-8-zulu 3.6.3	2m 2s
Verify / windows-latest jdk-8-zulu 3.9.9	2m 3s
Verify / macos-latest jdk-17-zulu 3.6.3	1m 27s
Verify / macos-latest jdk-17-zulu 3.9.9	1m 36s
Verify / macos-latest jdk-21-zulu 3.6.3	1m 13s
Verify / macos-latest jdk-21-zulu 3.9.9	1m 1s
Verify / macos-latest jdk-8-zulu 3.6.3	1m 20s
Verify / macos-latest jdk-8-zulu 3.9.9	1m 10s
	29m 58s

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