chore: Update Bazel support: drop 5, minimum 6.2, current 7.0

With the release of Bazel 7, support for 5 is no longer necessary.

Work towards bazelbuild#1069

.bazelci/presubmit.yml

@@ -21,8 +21,8 @@ buildifier:
 .minimum_supported_version: &minimum_supported_version
   # For testing minimum supported version.
   # NOTE: Keep in sync with //:version.bzl
-  bazel: 5.4.0
-  skip_in_bazel_downstream_pipeline: "Bazel 5 required"
+  bazel: 6.2.0
+  skip_in_bazel_downstream_pipeline: "Bazel 6 required"
 .minimum_supported_bzlmod_version: &minimum_supported_bzlmod_version
   bazel: 6.2.0 # test minimum supported version of bazel for bzlmod tests
 .reusable_config: &reusable_config
@@ -64,10 +64,7 @@ buildifier:
     - //tests:version_3_9_test
     - //tests:version_default_test
 .pystar_base: &pystar_base
-  # TODO: Change to "7.x" once Bazel 7 is available
-  # https://github.com/bazelbuild/bazel/commit/f3aafea59ae021c6a12086cb2cd34c5fa782faf1
-  # is available in rolling.
-  bazel: "last_rc"
+  bazel: "7.x"
   environment:
     RULES_PYTHON_ENABLE_PYSTAR: "1"
   test_flags:

.bazelversion

@@ -1 +1 @@
-6.2.0
+7.0.0

version.bzl

@@ -17,11 +17,11 @@
 # against.
 # This version should be updated together with the version of Bazel
 # in .bazelversion.
-BAZEL_VERSION = "6.2.0"
+BAZEL_VERSION = "7.0.0"
 
 # NOTE: Keep in sync with .bazelci/presubmit.yml
 # This is the minimum supported bazel version, that we have some tests for.
-MINIMUM_BAZEL_VERSION = "5.4.0"
+MINIMUM_BAZEL_VERSION = "6.2.0"
 
 # Versions of Bazel which users should be able to use.
 # Ensures we don't break backwards-compatibility,