Roll external/re2/ 601d9ea3e..a0b3bc60c (1 commit) (#5453)

https://github.com/google/re2/compare/601d9ea3e6a7...a0b3bc60c3a4

$ git log 601d9ea3e..a0b3bc60c --date=short --no-merges --format='%ad %ae %s'
2023-10-25 junyer Add support for Python 3.12.

Created with:
  roll-dep external/re2

Co-authored-by: GitHub Actions[bot] <>

DEPS

diff --git a/DEPS b/DEPS
index e8d5f40..f867b28 100644
--- a/DEPS
+++ b/DEPS
@@ -12,7 +12,7 @@
   # Use protobufs before they gained the dependency on abseil
   'protobuf_revision': 'v21.12',
 
-  're2_revision': '601d9ea3e6a768cb666e71012f0baf812a2d48da',
+  're2_revision': 'a0b3bc60c3a42b4e572bf643fa0e10bf60dcc872',
   'spirv_headers_revision': '88bc5e321c2839707df8b1ab534e243e00744177',
 }