update source for mail grammar (#14479)

Co-authored-by: Daniel Fichtinger <[email protected]>

Author: ficd0

languages.toml

@@ -1854,7 +1854,7 @@ injection-regex = "mail|eml|email"
 
 [[grammar]]
 name = "mail"
-source = { git = "https://github.com/ficcdaf/tree-sitter-mail", rev = "8e60f38efbae1cc5f22833ae13c5500dd0f3b12f" }
+source = { git = "https://codeberg.org/ficd/tree-sitter-mail", rev = "8e60f38efbae1cc5f22833ae13c5500dd0f3b12f" }
 
 [[language]]
 name = "markdown"