message: Fix Allow double quotes to delimit values in bibtex
diff: "string_content": {
  "patterns": [
  {
  - "begin": "\\{",
  + "begin": "\\{|\"",
  "beginCaptures": {
  "0": {
  "name": "punctuation.definition.string.begin.bibtex"
  }
  },
  - "end": "\\}",
  + "end": "\\}|\"",
  "endCaptures": {
  "0": {
  "name": "punctuation.definition.string.end.bibtex"
  