Update dependencies [AP-4083] (#1488)

# Description

@swift-nav/algint-team

Updates `rules_swiftnav` (incl
swift-nav/rules_swiftnav#166) and `bazel`.

# API compatibility

API compatibility is kept, because only test dependencies are updated.

## API compatibility plan

If the above is "Yes", please detail the compatibility (or migration)
plan:

n/a

# JIRA Reference

https://swift-nav.atlassian.net/browse/AP-4083

Author: martin4861

.bazeliskrc

@@ -1 +1 @@
-USE_BAZEL_VERSION=5.4.0
+USE_BAZEL_VERSION=6.5.0

WORKSPACE.bazel

@@ -4,18 +4,22 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "rules_swiftnav",
-    strip_prefix = "rules_swiftnav-cb82c790d50dd87f301df67b710161906dafb0c2",
-    url = "https://github.com/swift-nav/rules_swiftnav/archive/cb82c790d50dd87f301df67b710161906dafb0c2.tar.gz",
+    strip_prefix = "rules_swiftnav-c68035cad64215f6212974b57306f05f0d6015ef",
+    url = "https://github.com/swift-nav/rules_swiftnav/archive/c68035cad64215f6212974b57306f05f0d6015ef.tar.gz",
+    sha256 = "f5a6d31a16cd4f6efc96e43676d4d19c5c4e23332849a974cbd072c17490d141",
 )
 
 load(
     "@rules_swiftnav//cc:repositories.bzl",
     "register_swift_cc_toolchains",
     "swift_cc_toolchain",
+    "x86_64_sysroot",
 )
 
 swift_cc_toolchain()
 
+x86_64_sysroot()
+
 register_swift_cc_toolchains()
 
 http_archive(

c/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@rules_swiftnav//cc:defs.bzl", "UNIT", "swift_c_library", "swift_cc_test")
+load("@rules_swiftnav//cc:defs.bzl", "UNIT", "swift_c_library", "swift_c_test", "swift_cc_test")
 load("@hedron_compile_commands//:refresh_compile_commands.bzl", "refresh_compile_commands")
 
 SBP_INCLUDE = glob(["include/**/*.h"])
@@ -69,7 +69,7 @@ filegroup(
 
 SBP_C_SOURCES = glob(["test/auto*.c"])
 
-swift_cc_test(
+swift_c_test(
     name = "sbp-test",
     srcs = [
         "test/check_main.c",