Resolve compilation issue with Elixir 1.15

List of changes:
- Bump x509 dep (0.8.3 => 0.8.7), see voltone/x509#60
- Bump Elixir/OTP and GitHub Actions

.github/workflows/elixir.yml

@@ -14,19 +14,19 @@ jobs:
               elixir: "1.11.4"
               otp: "22.x"
           - pair:
-              elixir: "1.14.5"
+              elixir: "1.15.1"
               otp: "25.x"
             lint: lint
 
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: deps
           key: deps-${{ runner.os }}-${{ matrix.pair.otp }}-${{ matrix.pair.elixir }}-${{ hashFiles('**/mix.lock') }}
           restore-keys: deps-${{ runner.os }}-${{ matrix.pair.otp }}-${{ matrix.pair.elixir }}-
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         with:
           path: _build
           key: build-${{ runner.os }}-${{ matrix.pair.otp }}-${{ matrix.pair.elixir }}-${{ hashFiles('**/mix.lock') }}

mix.lock

@@ -25,5 +25,5 @@
   "plug_crypto": {:hex, :plug_crypto, "1.2.2", "05654514ac717ff3a1843204b424477d9e60c143406aa94daf2274fdd280794d", [:mix], [], "hexpm", "87631c7ad914a5a445f0a3809f99b079113ae4ed4b867348dd9eec288cecb6db"},
   "ranch": {:hex, :ranch, "1.8.0", "8c7a100a139fd57f17327b6413e4167ac559fbc04ca7448e9be9057311597a1d", [:make, :rebar3], [], "hexpm", "49fbcfd3682fab1f5d109351b61257676da1a2fdbe295904176d5e521a2ddfe5"},
   "telemetry": {:hex, :telemetry, "1.0.0", "0f453a102cdf13d506b7c0ab158324c337c41f1cc7548f0bc0e130bbf0ae9452", [:rebar3], [], "hexpm", "73bc09fa59b4a0284efb4624335583c528e07ec9ae76aca96ea0673850aec57a"},
-  "x509": {:hex, :x509, "0.8.3", "2306b7e9e9dce35cf16a2608c8d85027fa35f37b33c500b775362bbfd388d224", [:mix], [], "hexpm", "101650f2f35de8528878ae9cd449cb2d0cdcd9974733640ef320fad757594684"},
+  "x509": {:hex, :x509, "0.8.7", "576130ad83731613fdb5787917f2fadbe308b6f5a48ed6e865a4b6be3fa802d0", [:mix], [], "hexpm", "3604125d6a0171da6e8a935810b58c999fccab0e3d20b2ed28d97fa2d9e2f6b4"},
 }