[bazel] Upgrade to 7.3.0 (#102991)
Most importantly this rc has a change that we had to revert for
previously
diff --git a/utils/bazel/.bazelrc b/utils/bazel/.bazelrc
index 975667f..67fb4f4 100644
--- a/utils/bazel/.bazelrc
+++ b/utils/bazel/.bazelrc
@@ -6,6 +6,11 @@
# Common flags that apply to all configurations.
# Use sparingly for things common to all compilers and platforms.
###############################################################################
+
+# Flip off to disable MODULE.bazel until we're ready.
+# https://github.com/llvm/llvm-project/issues/55924
+common --enable_bzlmod=false
+
# Prevent invalid caching if input files are modified during a build.
build --experimental_guard_against_concurrent_changes
