Update bundled plugin-update-checker to v5.7 and remove broken setBranch() call

The bundled PUC was missing the setBranch() method on the main UpdateChecker
class (it's only on Vcs\PluginUpdateChecker via the VcsCheckerMethods trait).
When called with a non-VCS URL like the Gitea update URL, this caused a fatal
error at plugin activation.

Updating to PUC v5.7 (May 2026) which is the latest upstream release. The
setBranch() call is removed because PUC doesn't recognize Gitea as a VCS host;
the plugin falls back to PUC's plain JSON metadata mode, which is fine for a
plugin hosted on a self-managed repo.

includes/plugin-update-checker/languages/plugin-update-checker-fa_IR.po

@@ -1,38 +1,50 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: plugin-update-checker\n"
-"POT-Creation-Date: 2016-02-17 14:21+0100\n"
-"PO-Revision-Date: 2016-10-28 14:30+0330\n"
-"Last-Translator: studio RVOLA <hello@rvola.com>\n"
-"Language-Team: Pro Style <info@prostyle.ir>\n"
+"POT-Creation-Date: 2025-06-12 23:40+0100\n"
+"PO-Revision-Date: 2025-06-12 23:49+0100\n"
+"Last-Translator: Pro Style <info@prostyle.ir>\n"
+"Language-Team: Alex Javadi <alex@aljm.org>\n"
 "Language: fa_IR\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"X-Generator: Poedit 1.8.8\n"
-"X-Poedit-Basepath: ..\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"X-Generator: Poedit 3.6\n"
+"X-Poedit-Basepath: ..\n"
 "X-Poedit-SourceCharset: UTF-8\n"
 "X-Poedit-KeywordsList: __;_e\n"
 "X-Poedit-SearchPath-0: .\n"
 
-#: github-checker.php:120
-msgid "There is no changelog available."
-msgstr "شرحی برای تغییرات  یافت نشد"
+#: Puc/v5p6/Plugin/Ui.php:56
+msgid "View details"
+msgstr "مشاهده جزئیات"
 
-#: plugin-update-checker.php:637
+#: Puc/v5p6/Plugin/Ui.php:79
+#, php-format
+msgid "More information about %s"
+msgstr "اطلاعات بیشتر درباره %s"
+
+# It had some “potential” grammar issues and also didn’t sound native.
+# P.S. I know the current translation is literally “Checking for new updates”, however, I thought it might sound more natural and known to others.
+#: Puc/v5p6/Plugin/Ui.php:130
 msgid "Check for updates"
-msgstr "بررسی برای بروزرسانی "
+msgstr "بررسی بروزرسانی جدید"
 
-#: plugin-update-checker.php:681
-msgid "This plugin is up to date."
-msgstr "شما از آخرین نسخه استفاده میکنید . به‌روز باشید"
-
-#: plugin-update-checker.php:683
-msgid "A new version of this plugin is available."
-msgstr "نسخه جدیدی برای افزونه ارائه شده است ."
-
-#: plugin-update-checker.php:685
+# The word “ناشناخته” is seems to be translated directly from the word (Un-known), rather than checking for the context.
+# I think “نامشخص” (unknown) might be a suitable version in this scenario.
+#: Puc/v5p6/Plugin/Ui.php:227
 #, php-format
 msgid "Unknown update checker status \"%s\""
-msgstr "وضعیت ناشناخته برای بروزرسانی \"%s\""
+msgstr "وضعیت نامشخص برای بروزرسانی \"%s\""
+
+# The previous translation was okay, however, it didn’t sound native to me.
+#: Puc/v5p6/Vcs/PluginUpdateChecker.php:113
+msgid "There is no changelog available."
+msgstr "آخرین تغییراتی یافت نشد."
+
+#~ msgid "This plugin is up to date."
+#~ msgstr "شما از آخرین نسخه استفاده میکنید . به‌روز باشید"
+
+#~ msgid "A new version of this plugin is available."
+#~ msgstr "نسخه جدیدی برای افزونه ارائه شده است ."