Update common github actions (#3330)

Signed-off-by: Knative Automation <automation@knative.team>

.github/workflows/knative-releasability.yaml

@@ -60,7 +60,7 @@ jobs:
           go-version: 1.15.x
 
       - name: Install Dependencies
-        run: GO111MODULE=on go get knative.dev/test-infra/buoy@master
+        run: GO111MODULE=on go get knative.dev/test-infra/buoy@main
 
       - name: Check out code
         uses: actions/checkout@v2

.github/workflows/knative-release-notes.yaml

@@ -21,9 +21,9 @@ on:
   workflow_dispatch:
     inputs:
       branch:
-        description: 'Branch? (master)'
+        description: 'Branch? (main)'
         required: true
-        default: 'master'
+        default: 'main'
       start-sha:
         description: 'Starting SHA? (last tag on branch)'
       end-sha:

.github/workflows/knative-style.yaml

@@ -127,7 +127,7 @@ jobs:
         if: steps.golangci_configuration.outputs.files_exists == 'true'
         uses: golangci/golangci-lint-action@v2
         with:
-          version: v1.35
+          version: v1.38
 
       - name: misspell
         shell: bash