git: Update to version 2.42.1

git: Update to version 2.42.1

- Update from version 2.42.0 to 2.42.1
- Update of rootfile not required
- Changelog
	 * Tests that are known to pass with LSan are now marked as such.
	 * Flaky "git p4" tests, as well as "git svn" tests, are now skipped
	   in the (rather expensive) sanitizer CI job.
	 * Tests with LSan from time to time seem to emit harmless message
	   that makes our tests unnecessarily flaky; we work it around by
	   filtering the uninteresting output.
	 * GitHub CI workflow has learned to trigger Coverity check.
	 * Overly long label names used in the sequencer machinery are now
	   chopped to fit under filesystem limitation.
	 * Scalar updates.
	 * Tweak GitHub Actions CI so that pushing the same commit to multiple
	   branch tips at the same time will not waste building and testing
	   the same thing twice.
	 * The commit-graph verification code that detects mixture of zero and
	   non-zero generation numbers has been updated.
	 * "git diff -w --exit-code" with various options did not work
	   correctly, which is being addressed.
	 * transfer.unpackLimit ought to be used as a fallback, but overrode
	   fetch.unpackLimit and receive.unpackLimit instead.
	 * The use of API between two calls to require_clean_work_tree() from
	   the sequencer code has been cleaned up for consistency.
	 * "git diff --no-such-option" and other corner cases around the exit
	   status of the "diff" command has been corrected.
	 * "git for-each-ref --sort='contents:size'" sorts the refs according
	   to size numerically, giving a ref that points at a blob twelve-byte
	   (12) long before showing a blob hundred-byte (100) long.
	 * Various fixes to the behavior of "rebase -i" when the command got
	   interrupted by conflicting changes.
	 * References from description of the `--patch` option in various
	   manual pages have been simplified and improved.
	 * "git grep -e A --no-or -e B" is accepted, even though the negation
	   of "or" did not mean anything, which has been tightened.
	 * The completion script (in contrib/) has been taught to treat the
	   "-t" option to "git checkout" and "git switch" just like the
	   "--track" option, to complete remote-tracking branches.
	 * "git diff --no-index -R <(one) <(two)" did not work correctly,
	   which has been corrected.
	 * Update "git maintenance" timers' implementation based on systemd
	   timers to work with WSL.
	 * "git diff --cached" codepath did not fill the necessary stat
	   information for a file when fsmonitor knows it is clean and ended
	   up behaving as if it is not clean, which has been corrected.
	 * Clarify how "alias.foo = : git cmd ; aliased-command-string" should
	   be spelled with necessary whitespaces around punctuation marks to
	   work.
	 * HTTP Header redaction code has been adjusted for a newer version of
	   cURL library that shows its traces differently from earlier
	   versions.
	 * An error message given by "git send-email" when given a malformed
	   address did not give correct information, which has been corrected.
	 * UBSan options were not propagated through the test framework to git
	  run via the httpd, unlike ASan options, which has been corrected.
	 Also contains various documentation updates, code clean-ups and minor fixups.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>