Use act10ns/slack@v2.2.0

Author: sue445

.github/workflows/test.yml

@@ -43,7 +43,7 @@ jobs:
       - run: bundle exec rake spec
 
       - name: Slack Notification (not success)
-        uses: act10ns/slack@2f01f46db9f41c75a04d93c6ce310bc51db7cb50 # v2
+        uses: act10ns/slack@d96404edccc6d6467fc7f8134a420c851b1e9054 # v2.2.0
         if: "! success()"
         continue-on-error: true
         with:
@@ -71,7 +71,7 @@ jobs:
       - run: bundle exec rake rubocop
 
       - name: Slack Notification (not success)
-        uses: act10ns/slack@2f01f46db9f41c75a04d93c6ce310bc51db7cb50 # v2
+        uses: act10ns/slack@d96404edccc6d6467fc7f8134a420c851b1e9054 # v2.2.0
         if: "! success()"
         continue-on-error: true
         with:
@@ -99,7 +99,7 @@ jobs:
       - run: bundle exec rake rbs
 
       - name: Slack Notification (not success)
-        uses: act10ns/slack@2f01f46db9f41c75a04d93c6ce310bc51db7cb50 # v2
+        uses: act10ns/slack@d96404edccc6d6467fc7f8134a420c851b1e9054 # v2.2.0
         if: "! success()"
         continue-on-error: true
         with:
@@ -130,7 +130,7 @@ jobs:
           ls -ld doc/
 
       - name: Slack Notification (not success)
-        uses: act10ns/slack@2f01f46db9f41c75a04d93c6ce310bc51db7cb50 # v2
+        uses: act10ns/slack@d96404edccc6d6467fc7f8134a420c851b1e9054 # v2.2.0
         if: "! success()"
         continue-on-error: true
         with: