update ci runner version (#79)

Signed-off-by: mingzhou.swx <mingzhou.swx@alibaba-inc.com>
Co-authored-by: mingzhou.swx <mingzhou.swx@alibaba-inc.com>

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ env:
 
 jobs:
   golangci-lint:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -41,7 +41,7 @@ jobs:
 
   build-and-test:
     name: ci-build
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/release.yaml

@@ -12,7 +12,7 @@ env:
 
 jobs:
   build_and_upload:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         TARGETS: [ linux/amd64, darwin/amd64, windows/amd64, linux/arm64, darwin/arm64 ]