expat: uprev to 2.2.10

A "Pointer-overflow in hashTableIterInit" was being caught by the UBSAN
fuzzer and an uprev to 2.2.10 should fix as mentioned in the changelogs:
https://github.com/libexpat/libexpat/blob/R_2_2_10/expat/Changes

BUG=chromium:1151394
TEST=emerge-$B expat

Change-Id: Ifaf727b620d62e7ae4cafedfc8606ee9ded296ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2551685
Tested-by: Jae Hoon Kim <kimjae@chromium.org>
Auto-Submit: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
diff --git a/dev-libs/expat/Manifest b/dev-libs/expat/Manifest
index c205935..e54919a 100644
--- a/dev-libs/expat/Manifest
+++ b/dev-libs/expat/Manifest
@@ -1 +1 @@
-DIST expat-2.2.9.tar.xz 422460 BLAKE2B ea0e0bd005bbfd355e819e2b157859878a20ad9a6807cc5a10a6656f062e2443adb483adb0452d751b3d460834e3f613b8ecf7cdaf743be1b15815d005d01fa6 SHA512 e082874efcc4b00709e2c0192c88fb15dfc4f33fc3a2b09e619b010ea93baaf7e7572683f738463db0ce2350cab3de48a0c38af6b74d1c4f5a9e311f499edab0
+DIST expat-2.2.10.tar.xz 425432 BLAKE2B 5d84d7dec5aae6ca7906bd2a2b8a249457111e064295b83b6c9927b5ef0dc97e7220bac1da17781e24541259ae81b60a2314cd372bfbdfc2e08fab082377df4a SHA512 a8e0c8a9cf7e6fbacdc6e709f3c99c533ab550fba52557d24259bb8b360f9697624c7500c0e9886fa57ee2b529aadd0d1835d66fe8112e15c20df75cd3eb090f
diff --git a/dev-libs/expat/expat-2.2.9.ebuild b/dev-libs/expat/expat-2.2.10.ebuild
similarity index 100%
rename from dev-libs/expat/expat-2.2.9.ebuild
rename to dev-libs/expat/expat-2.2.10.ebuild