merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

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diff --git a/third_party/git/Documentation/RelNotes/1.7.7.6.txt b/third_party/git/Documentation/RelNotes/1.7.7.6.txt
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+Git v1.7.7.6 Release Notes
+==========================
+
+Fixes since v1.7.7.5
+--------------------
+
+ * The code to look up attributes for paths reused entries from a wrong
+   directory when two paths in question are in adjacent directories and
+   the name of the one directory is a prefix of the other.
+
+ * A wildcard that matches deeper hierarchy given to the "diff-index" command,
+   e.g. "git diff-index HEAD -- '*.txt'", incorrectly reported additions of
+   matching files even when there is no change.
+
+ * When producing a "thin pack" (primarily used in bundles and smart
+   HTTP transfers) out of a fully packed repository, we unnecessarily
+   avoided sending recent objects as a delta against objects we know
+   the other side has.
+
+Also contains minor fixes and documentation updates.