[elpa] externals/csharp-mode updated (c0c7602 -> 515b866)

[ELPA Syncer]

elpasync pushed a change to branch externals/csharp-mode.

      from  c0c7602   Update build.yml
       new  21c4b19   Add support for multiline strings (#251)
       new  515b866   Bump version to 1.1.0


Summary of changes:
 csharp-compilation.el            |  2 +-
 csharp-mode-tests.el             | 39 +++++++++++++++++++++++++--------------
 csharp-mode.el                   | 39 ++++++++++++++++++++++++++++++++++++++-
 csharp-tree-sitter.el            |  2 +-
 test-files/fontification-test.cs |  2 +-
 test-files/multiline-strings.cs  |  6 ++++++
 6 files changed, 72 insertions(+), 18 deletions(-)
 create mode 100644 test-files/multiline-strings.cs