Update to Bazel 6.5.0

This is the last release in the Bazel 6 line. With the changes up to
this point, the Bazel 7 build only fails on protobuf generation, e.g.
on `bazel build //test/proto3:all`, as seen below. Bumping to Bazel
6.5.0 on top of all the previous changes isolates the Bazel 7.0.0
changes causing the failure.

```txt
$ bazel build //test/proto3:all

ERROR: .../rules_scala/test/proto3/BUILD:14:14:
  ProtoScalaPBRule test/proto3/generated-proto-lib_jvm_extra_protobuf_generator_scalapb.srcjar
  failed: (Exit 1): scalapb_worker failed:
  error executing ProtoScalaPBRule command
  (from target //test/proto3:generated-proto-lib)
  bazel-out/darwin_arm64-opt-exec-ST-13d3ddad9198/bin/src/scala/scripts/scalapb_worker
    ... (remaining 2 arguments skipped)

Could not find file in descriptor database:
  bazel-out/darwin_arm64-fastbuild/bin/test/proto3/generated.proto:
  No such file or directory

java.lang.RuntimeException: Exit with code 1
        at scala.sys.package$.error(package.scala:30)
        at scripts.ScalaPBWorker$.work(ScalaPBWorker.scala:44)
        at io.bazel.rulesscala.worker.Worker.persistentWorkerMain(Worker.java:96)
        at io.bazel.rulesscala.worker.Worker.workerMain(Worker.java:49)
        at scripts.ScalaPBWorker$.main(ScalaPBWorker.scala:39)
        at scripts.ScalaPBWorker.main(ScalaPBWorker.scala)
Use --verbose_failures to see the command lines of failed build steps.

ERROR: .../rules_scala/test/proto3/BUILD:14:14
  scala @//test/proto3:generated-proto-lib
  failed: (Exit 1): scalapb_worker failed:
  error executing ProtoScalaPBRule command
  (from target //test/proto3:generated-proto-lib)
  bazel-out/darwin_arm64-opt-exec-ST-13d3ddad9198/bin/src/scala/scripts/scalapb_worker
    ... (remaining 2 arguments skipped)
```

Author: mbland

.bazelci/presubmit.yml

@@ -47,16 +47,16 @@ tasks:
     platform: windows
     shell_commands:
     - "bash test_rules_scala.sh"
-  test_coverage_linux_6_3_0:
+  test_coverage_linux_6_5_0:
     name: "./test_coverage"
     platform: ubuntu2004
-    bazel: 6.3.0
+    bazel: 6.5.0
     shell_commands:
       - "./test_coverage.sh"
-  test_coverage_macos_6.3.0:
+  test_coverage_macos_6.5.0:
     name: "./test_coverage"
     platform: macos
-    bazel: 6.3.0
+    bazel: 6.5.0
     shell_commands:
       - "./test_coverage.sh"
   test_reproducibility_linux:
@@ -82,13 +82,13 @@ tasks:
   examples_linux:
     name: "./test_examples"
     platform: ubuntu2004
-    bazel: 6.3.0
+    bazel: 6.5.0
     shell_commands:
       - "./test_examples.sh"
   cross_build_linux:
     name: "./test_cross_build"
     platform: ubuntu2004
-    bazel: 6.3.0
+    bazel: 6.5.0
     shell_commands:
       - "./test_cross_build.sh"
   lint_linux:

.bazelversion

@@ -1 +1 @@
-6.3.0
+6.5.0