Update dependency http-proxy-middleware to v0.21.0

This MR contains the following updates:

Package	Type	Update	Change
http-proxy-middleware	devDependencies	minor	0.17.4 -> 0.21.0

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mentioned in issue #1143 (closed)

marked the checklist item If you want to rebase/retry this MR, click this checkbox. as completed

added 9 commits

• 4967a38c...6b14b645 - 8 commits from branch develop
• 6074ad67 - Update dependency http-proxy-middleware to v0.21.0

Compare with previous version

marked the checklist item If you want to rebase/retry this MR, click this checkbox. as incomplete

mentioned in commit 2f24f331

merged