Switch QUICHE standalone build to use the newest Bazel actually supported by our CI bots.

PiperOrigin-RevId: 698942942

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 815da58..66ce77b 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-7.4.1
+7.0.0