chore(deps): bump skills/action-text-variables from 2 to 3 (#73)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/finish-exercise.yml

@@ -69,7 +69,7 @@ jobs:
 
       - name: Build congratulations message from template
         id: build-new-readme
-        uses: skills/action-text-variables@v2
+        uses: skills/action-text-variables@v3
         with:
           template-file: exercise-toolkit/markdown-templates/readme/exercise-finished.md
           template-vars: |
@@ -103,7 +103,7 @@ jobs:
 
       - name: Build message - exercise finished
         id: build-finish-message
-        uses: skills/action-text-variables@v2
+        uses: skills/action-text-variables@v3
         with:
           template-file: exercise-toolkit/markdown-templates/step-feedback/exercise-finished.md
           template-vars: |

.github/workflows/start-exercise.yml

@@ -71,7 +71,7 @@ jobs:
 
       - name: Build welcome message from template
         id: build-issue-description
-        uses: skills/action-text-variables@v2
+        uses: skills/action-text-variables@v3
         with:
           template-file: exercise-toolkit/markdown-templates/step-feedback/welcome.md
           template-vars: |
@@ -114,7 +114,7 @@ jobs:
 
       - name: Build welcome message from template
         id: build-new-readme
-        uses: skills/action-text-variables@v2
+        uses: skills/action-text-variables@v3
         with:
           template-file: exercise-toolkit/markdown-templates/readme/exercise-started.md
           template-vars: |