Fix invalid path to replace-string action

test-upstream-merge/action.yml

@@ -159,7 +159,7 @@ runs:
         echo "merge-base=${merge_base}" >> $GITHUB_OUTPUT
 
     - name: Create PR body
-      uses: Cardinal-Cryptography/replace-string@v3
+      uses: Cardinal-Cryptography/github-actions/replace-string@v3
       with:
         read-from-file: ${{ github.action_path }}/pr-body.txt
         write-to-file: pr-body-to-add.txt
@@ -181,7 +181,7 @@ runs:
           ${{ steps.get-merge-base.outputs.merge-base }}
     
     - name: Replace newline chars
-      uses: Cardinal-Cryptography/replace-string@v3
+      uses: Cardinal-Cryptography/github-actions/replace-string@v3
       id: pr-body-for-json
       with:
         read-from-file: pr-body-to-add.txt
@@ -190,7 +190,7 @@ runs:
         replace-with: \\n
 
     - name: Create JSON payload
-      uses: Cardinal-Cryptography/replace-string@v3
+      uses: Cardinal-Cryptography/github-actions/replace-string@v3
       with:
         read-from-file: ${{ github.action_path }}/gh-api-payload.json
         write-to-file: gh-api-payload-to-send.json
@@ -248,7 +248,7 @@ runs:
 
     - name: Create failure slack notification
       if: ${{ steps.check-if-merge-needed.outputs.merge == 'yes' && steps.merge-upstream.outputs.merge-failed == '1' }}
-      uses: Cardinal-Cryptography/replace-string@v3
+      uses: Cardinal-Cryptography/github-actions/replace-string@v3
       with:
         read-from-file: ${{ github.action_path }}/slack-msg-failure.json
         write-to-file: slack-msg-failure-to-use.json
@@ -267,7 +267,7 @@ runs:
 
     - name: Create success slack notification
       if: ${{ steps.check-if-merge-needed.outputs.merge == 'yes' && steps.merge-upstream.outputs.merge-failed == '0' }}
-      uses: Cardinal-Cryptography/replace-string@v3
+      uses: Cardinal-Cryptography/github-actions/replace-string@v3
       with:
         read-from-file: ${{ github.action_path }}/slack-msg-failure.json
         write-to-file: slack-msg-success-to-use.json