pinnned workflow files to ubuntu 22.

Author: SurfingNerd

.github/workflows/build-test.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         platform:
-          - ubuntu-latest
+          - ubuntu-22.04
         #  - macos-latest
         toolchain:
           -  1.75

.github/workflows/check.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   check:
     name:                       Check
-    runs-on:                    ubuntu-20.04
+    runs-on:                    ubuntu-22.04
     steps:
       - name:                   Checkout sources
         uses:                   actions/checkout@main

.github/workflows/fmt.yml

@@ -5,7 +5,7 @@ name: rustfmt
 jobs:
   fmt:
     name: Rustfmt
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1