Upgrade to ubuntu-22.04. (#173)

Author: cjyar

.github/workflows/ci.yaml

@@ -10,7 +10,7 @@ jobs:
   # Abort if the code isn't formatted according to rustfmt standards from nightly.
   fmt:
     name: Rustfmt
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
       - name: Cache cargo
@@ -36,11 +36,11 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: ubuntu-18.04
+          - os: ubuntu-22.04
             target: aarch64-linux-android # Android x64
-          - os: ubuntu-18.04
+          - os: ubuntu-22.04
             target: x86_64-unknown-linux-musl # Alpine Linux x86_64
-          - os: ubuntu-18.04
+          - os: ubuntu-22.04
             target: wasm32-unknown-unknown
             features: --features wasm --no-default-features
           - os: macos-10.15
@@ -69,7 +69,7 @@ jobs:
   # Run the tests on only one architecture, against various Rust versions.
   test:
     name: Test Suite
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         rust:
@@ -93,7 +93,7 @@ jobs:
   # Benchmark current and base revisions, if this is a PR.
   bench:
     name: Bench
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     if: github.base_ref != ''
     strategy:
       matrix:
@@ -133,7 +133,7 @@ jobs:
     needs:
       - bench
     name: Upload benchmark results
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
       - name: Cache cargo

.github/workflows/security-audit.yaml

@@ -4,7 +4,7 @@ on:
     - cron: "0 8 * * *" # 8AM UTC, 3PM MST
 jobs:
   audit:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/audit-check@v1