Update git blame rev ignore list (#7620)

In the recently merged #7615 we bumped the black version and constrained
it to a stable version to keep us on a fixed set of formatting rules but
also receiving bug fixes. In doing this some new formatting rules were
applied to the repo (mainly `x ** y` was changed to `x**y`) by the new
version of black. To reduce noise in the git blame this commit updates
the .git-blame-ignore-revs file (which was added after we started using
black in #6362) to include the sha1 for this commit. This means that
when running git blame on files this commit will be ignored (assuming
the local git environment is configured correctly).

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.git-blame-ignore-revs

@@ -1 +1,2 @@
 2eee56616d50a9e26756f855ef4aa0135920ad78
+3763e61f16f97598cb0fa317277ad85fa15db738