[2.5] Fix flower example requirements (#3163)

Fixes #3128 .

### Description

Flower >= 1.13 has breaking changes, pin the version for release.
The integration with the new flower version will come in the next
release.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Quick tests passed locally by running `./runtest.sh`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated.

Co-authored-by: Chester Chen <[email protected]>

examples/hello-world/hello-flower/flwr-pt-tb/pyproject.toml

@@ -8,7 +8,7 @@ version = "1.0.0"
 description = ""
 license = "Apache-2.0"
 dependencies = [
-    "flwr[simulation]>=1.11.0,<2.0",
+    "flwr[simulation]==1.11.0",
     "nvflare~=2.5.0rc",
     "torch==2.2.1",
     "torchvision==0.17.1",

examples/hello-world/hello-flower/flwr-pt/pyproject.toml

@@ -8,10 +8,11 @@ version = "1.0.0"
 description = ""
 license = "Apache-2.0"
 dependencies = [
-    "flwr[simulation]>=1.11.0,<2.0",
+    "flwr[simulation]==1.11.0",
     "nvflare~=2.5.0rc",
     "torch==2.2.1",
     "torchvision==0.17.1",
+    "tensorboard"
 ]
 
 [tool.hatch.build.targets.wheel]