Bump idna from 3.10 to 3.15

Bumps [idna](https://github.com/kjd/idna) from 3.10 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](https://github.com/kjd/idna/compare/v3.10...v3.15)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.15'
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.1.3 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.2.1 and should not be changed by hand.
 
 [[package]]
 name = "accessible-pygments"

src/auto_archiver/utils/deletion_detection.py

@@ -64,6 +64,7 @@ class DeletionIndicators:
     # YouTube deletion indicators
     YOUTUBE = [
         "This video isn't available anymore",
+        "Video unavailable",
         "This video has been removed",
         "This video is no longer available",
         "This video is private",