Update quay.io/hedgedoc/hedgedoc Docker tag to v1.9.9

This MR contains the following updates:

Package	Update	Change
quay.io/hedgedoc/hedgedoc	patch	1.9.7-debian -> 1.9.9-debian

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This MR has been generated by Renovate Bot.

mentioned in issue #40

changed title from Update quay.io/hedgedoc/hedgedoc Docker tag to v1.9.8 to Update quay.io/hedgedoc/hedgedoc Docker tag to v1.9.9

changed the description

added 4 commits

• 716282cd...3309633c - 3 commits from branch master
• c0d69a63 - Update quay.io/hedgedoc/hedgedoc Docker tag to v1.9.9

Compare with previous version

merged

mentioned in commit b32b7213