[Renovate] Update actions/checkout action to v4.1.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	patch	v4.1.0 -> v4.1.1

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[github-actions]

Filename                               Stmts    Miss  Cover    Missing
-----------------------------------  -------  ------  -------  ----------------------------------------------
src/graphing/agd.rs                      228       2  99.12%   355, 377
src/graphing/graph.rs                    219       3  98.63%   27, 109, 343
src/traits/append_as_line.rs              12       0  100.00%
src/traits/rusty_object_notation.rs       14       0  100.00%
src/traits/to_stderr.rs                    6       0  100.00%
src/traits/read_file.rs                   56      39  30.36%   54-56, 69-71, 77-100, 105, 112-123, 133-146
src/traits/convert_buffer.rs              30       0  100.00%
src/traits/prefer.rs                       5       0  100.00%
src/traits/colour_message.rs              19       0  100.00%
src/macros.rs                             18       0  100.00%
src/application.rs                        64      64  0.00%    32-186
src/complain.rs                          173      17  90.17%   29-70, 298, 302, 306, 310, 314, 318, 322
src/cffreference.rs                      104       0  100.00%
src/increment_version.rs                 152      22  85.53%   32-48, 123-125, 144, 150-155, 234-235, 251-260
src/main.rs                                3       3  0.00%    22-24
src/running.rs                             8       0  100.00%
src/version.rs                            69       0  100.00%
src/changelog/fragment.rs                 88      55  37.50%   25, 98-178
src/changelog/comment_changes.rs         267     267  0.00%    26-448
src/changelog/ronlog.rs                  194     129  33.51%   26-249, 315
src/pattern/writer.rs                    125      51  59.20%   134-139, 146-154, 188-200, 232-262
src/pattern/io_processor.rs               56      56  0.00%    73-162
src/pattern/buffer.rs                     33       0  100.00%
TOTAL                                   1943     708  63.56%