Update tree-sitter-gleam and highlights

This contains a few syntax fixes. The highlights have been updated as
well for reserved identifiers and escape sequences

languages.toml

@@ -1795,7 +1795,7 @@ auto-format = true
 
 [[grammar]]
 name = "gleam"
-source = { git = "https://github.com/gleam-lang/tree-sitter-gleam", rev = "b2afa4fd6bb41a7bf912b034c653c90af7ae5122" }
+source = { git = "https://github.com/gleam-lang/tree-sitter-gleam", rev = "bcf9c45b56cbe46e9dac5eee0aee75df270000ac" }
 
 [[language]]
 name = "ron"

runtime/queries/gleam/highlights.scm

@@ -61,10 +61,17 @@
 
 ; Literals
 (string) @string
+((escape_sequence) @warning
+ (#eq? @warning "\\e")) ; deprecated escape sequence
+(escape_sequence) @constant.character.escape
 (bit_string_segment_option) @function.builtin
 (integer) @constant.numeric.integer
 (float) @constant.numeric.float
 
+; Reserved identifiers
+((identifier) @error
+ (#any-of? @error "auto" "delegate" "derive" "else" "implement" "macro" "test" "echo"))
+
 ; Variables
 (identifier) @variable
 (discard) @comment.unused