[DOCS]: Fix duplicate contributor entries in v1.1.20 release notes

[palashmon]

The "Thank you to 21 community contributors" section in the v1.1.20 release notes contains duplicate entries for several authors.

Examples:

• LeonMueller-OneAndOnly (double entry for fix(TUI): make tui work when OPENCODE_SERVER_PASSWORD is set #8179)
• Eduard-Voiculescu (double entry for docs: Update plan mode restrictions #8290)
• mthezi (double entry for docs: add 302ai provider #8142)
• there are few more...

Expected:
Each contribution should be listed only once.

[rekram1-node]

believe this was due to a force push that corrupted commit history

[rekram1-node]

/oc can u figure out what happened in oru changelog script that could cause this? And then fix plz

[opencode-agent]

Created PR #8522

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