Sync flag icons with upstream

* Includes all 268 flags.
* Upstream commit `a7b7c3c55560cb39d96e70324876e1bb5b1c625b` - (Release v6.11.0)
* Flags source from (zip): https://github.com/lipis/flag-icons/releases/tag/v6.11.0

PR #19518.

src/icons/flags/bo.svg

@@ -486,7 +486,7 @@
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-  <path fill="none" stroke="#e7e7e7" stroke-linecap="round" stroke-linejoin="round" stroke-width=".1" d="M329.9 258.6v-.6" class="fil1 str2"/>
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