[roll recipes_version.txt] xrefs: Update access of env var

Original-Bug: 600
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/81020

https://pigweed.googlesource.com/infra/recipes
recipes_version.txt Rolled-Commits: 611c5706be42984..1749f47d513a747

GitOrigin-RevId: d6bc91860bdd852d20d86a6e88a795549683f7d2
Change-Id: Ief1ec039691f0be55162f8ac8749205f3e18f469
diff --git a/recipes_version.txt b/recipes_version.txt
index a4de6b8..e9f248d 100644
--- a/recipes_version.txt
+++ b/recipes_version.txt
@@ -1 +1 @@
-611c5706be42984a856eaf6a7db68795f325ae9d
\ No newline at end of file
+1749f47d513a7473a0feb372a3c999281f1700fd
\ No newline at end of file