Update minimum Elixir to 12, update ci and tool-versions · elixir-grpc/grpc@ab57b28

The job was canceled because "_24_x_1_15_x" failed.

Run Tests: test/grpc/client/adapters/gun_test.exs#L55

test connect/2 connects securely (custom options) (GRPC.Client.Adapters.GunTest)

Run Tests: test/grpc/client/adapters/gun_test.exs#L41

test connect/2 connects securely (default options) (GRPC.Client.Adapters.GunTest)

Run Tests: test/grpc/client/adapters/mint/connection_process_test.exs#L19

test start_link/4 non-successful connection stops the connection process without exit it's caller (GRPC.Client.Adapters.Mint.ConnectionProcessTest)

Run Tests: test/grpc/server/adapters/cowboy_test.exs#L7

test child_spec/4 produces the correct socket opts for ranch_tcp for inet (GRPC.Server.Adapters.CowboyTest)

Run Tests: test/grpc/server/adapters/cowboy_test.exs#L21

test child_spec/4 produces the correct socket opts for ranch_tcp for inet6 (GRPC.Server.Adapters.CowboyTest)

Run Tests: test/grpc/integration/connection_test.exs#L29

test authentication works (GRPC.Integration.ConnectionTest)

The operation was canceled.

Run Tests: lib/grpc/server/supervisor.ex#L111

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Run Tests: lib/grpc/transport/http2.ex#L96

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Run Tests: test/support/integration_test_case.ex#L40

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Run Tests: lib/grpc/server/adapters/cowboy/handler.ex#L170

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Run Tests: lib/grpc/server/adapters/cowboy/handler.ex#L461

Logger.warn/1 is deprecated. Use Logger.warning/2 instead