Bump Bazel version to 7.0.1

In Bazel 7.x release line, the bzlmod feature is activated per default,
so that we need to disable it. See this issue for more details: [1].

[1] https://github.com/bazelbuild/bazel/issues/18958

Change-Id: I252944a7d388daae676a420709f0e6c2002588d7

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 91e4a9f..9fe9ff9 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-6.3.2
+7.0.1