Fix identation errors

Replace accidental tabs by two spaces so that the resulting rendered
example looks correctly.

README.md

@@ -41,8 +41,8 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/forgejo-release@v1
         with:
-	        direction: upload
-	        url: https://code.forgejo.org
+          direction: upload
+          url: https://code.forgejo.org
           release-dir: dist/release
           release-notes: "MY RELEASE NOTES"
 ```
@@ -60,8 +60,8 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/forgejo-release@v1
         with:
-	        direction: download
-	        url: https://code.forgejo.org
+          direction: download
+          url: https://code.forgejo.org
           repo: forgejo/forgejo
           tag: v1.21.4-0
           release-dir: ./  # by default, files are downloaded into dist/release