git: 2.26.2 -> 2.27.0 (#89355)

disable_test: Use \s instead of ' ' as tabs are used for indentation in
t5324-split-commit-graph.sh. It's also necessary to insert : (no op) in
front of # to prevent Bash syntax errors due to empty loops.

Two newly added tests fail due the usage of shared permissions (outside
of the build sandbox they succeed, actually even with breakpointHook
(cntr attach + cntr exec bash)):
```
t5324-split-commit-graph.sh                      (Wstat: 256 Tests: 29
Failed: 2)
  Failed tests:  28-29
  Non-zero exit status: 1
```

I'm also adding myself as maintainer since there currently doesn't seem
to be a fixed one for regular updates.

Announcement:
https://lkml.kernel.org/lkml/xmqqzh9mu4my.fsf@gitster.c.googlers.com/

pkgs/applications/version-management/git-and-tools/git/default.nix

@@ -21,7 +21,7 @@ assert sendEmailSupport -> perlSupport;
 assert svnSupport -> perlSupport;
 
 let
-  version = "2.26.2";
+  version = "2.27.0";
   svn = subversionClient.override { perlBindings = perlSupport; };
 
   gitwebPerlLibs = with perlPackages; [ CGI HTMLParser CGIFast FCGI FCGIProcManager HTMLTagCloud ];
@@ -33,7 +33,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "https://www.kernel.org/pub/software/scm/git/git-${version}.tar.xz";
-    sha256 = "0j685w6pzkn926z5nf5r8fij4ziipvw4c9yb0wc577nzf4j16rbd";
+    sha256 = "1ybk39ylvs32lywq7ra4l2kdr5izc80r9461hwfnw8pssxs9gjkk";
   };
 
   outputs = [ "out" "doc" ];
@@ -286,13 +286,14 @@ stdenv.mkDerivation {
         mv t/{,skip-}$test.sh || true
       else
         sed -i t/$test.sh \
-          -e "/^ *test_expect_.*$pattern/,/^ *' *\$/{s/^/#/}"
+          -e "/^\s*test_expect_.*$pattern/,/^\s*' *\$/{s/^/: #/}"
       fi
     }
 
     # Shared permissions are forbidden in sandbox builds.
     disable_test t0001-init shared
     disable_test t1301-shared-repo
+    disable_test t5324-split-commit-graph 'split commit-graph respects core.sharedrepository'
 
     # Our patched gettext never fallbacks
     disable_test t0201-gettext-fallbacks
@@ -343,6 +344,6 @@ stdenv.mkDerivation {
     '';
 
     platforms = stdenv.lib.platforms.all;
-    maintainers = with stdenv.lib.maintainers; [ peti wmertens globin ];
+    maintainers = with stdenv.lib.maintainers; [ primeos peti wmertens globin ];
   };
 }