build: Set precise runner versions

Author: Stranger6667

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
 
   commitsar:
     name: Verify commit messages
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Check out code
         uses: actions/checkout@v1
@@ -19,7 +19,7 @@ jobs:
 
   pre-commit:
     name: Generic pre-commit checks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:
@@ -34,7 +34,7 @@ jobs:
 
   test-stable:
     name: Test (stable)
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:
@@ -59,7 +59,7 @@ jobs:
 
   fmt:
     name: Rustfmt
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -73,7 +73,7 @@ jobs:
 
   clippy:
     name: Clippy
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
@@ -89,7 +89,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-20.04, macos-11, windows-2019]
         python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
 
     name: Python ${{ matrix.python-version }} on ${{ matrix.os }}
@@ -116,7 +116,7 @@ jobs:
         working-directory: ./bindings/python
 
   test-python-sdist:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     name: Testing Python source code distribution
     steps:
       - uses: actions/checkout@v2
@@ -144,7 +144,7 @@ jobs:
 
   test-wasm:
     name: Tests for WASM crate
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:
@@ -165,7 +165,7 @@ jobs:
 
   test-wasm-typescript:
     name: TypeScript tests for WASM crate
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
         with:

.github/workflows/rust-release.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   rust-release:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1

.github/workflows/wasm-release.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   wasm-release:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1