treewide: bump bazel to 7.4.1

This is required to allow disk cache garbage collection.

Change-Id: I8ecc48636746c4fe076dba0655785e02b6d8caa4
Reviewed-on: https://review.monogon.dev/c/monogon/+/3755
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/.bazelversion b/.bazelversion
index b26a34e..815da58 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-7.2.1
+7.4.1