Bump slackapi/slack-github-action from 1.25.0 to 1.26.0

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.25.0 to 1.26.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.25.0...v1.26.0)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -99,7 +99,7 @@ jobs:
           webapp="${{ vars.ECR_URL }}:$SHA"
 
       - name: Send deploy notification to product Slack channel
-        uses: slackapi/slack-github-action@v1.25.0
+        uses: slackapi/slack-github-action@v1.26.0
         with:
           payload: |
             {
@@ -168,7 +168,7 @@ jobs:
           webapp="${{ vars.ECR_URL }}:$SHA"
 
       - name: Send deploy notification to product Slack channel
-        uses: slackapi/slack-github-action@v1.25.0
+        uses: slackapi/slack-github-action@v1.26.0
         with:
           payload: |
             {
@@ -198,7 +198,7 @@ jobs:
           SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
 
       - name: Send deploy notification to product Slack channel
-        uses: slackapi/slack-github-action@v1.25.0
+        uses: slackapi/slack-github-action@v1.26.0
         with:
           payload: |
             {