Bazel: bump rules_jvm_external to 6.10

Upgrade rules_jvm_external to 6.10 to pick up recent bzlmod-related
improvements, including support for known_contributing_modules in
maven.install().

No dependency versions are changed.

Change-Id: I91096366badaae3d8152da0c32ee10319476c4c3

Author: davido

MODULE.bazel

@@ -1,7 +1,7 @@
 module(name = "jgit")
 
 bazel_dep(name = "rules_java", version = "8.11.0")
-bazel_dep(name = "rules_jvm_external", version = "6.7")
+bazel_dep(name = "rules_jvm_external", version = "6.10")
 bazel_dep(name = "rbe_autoconfig")
 git_override(
     module_name = "rbe_autoconfig",