chore: update copyright year to 2026 (#1983)

**Issue number:**

### PR Type

**What kind of change does this PR introduce?**
* [ ] Feature
* [ ] Bug Fix
* [ ] Refactoring (no functional or API changes)
* [ ] Documentation Update
* [x] Maintenance (dependency updates, CI, etc.)

## Summary

### Changes

Year needs updating.

### User experience

No changes.

## Checklist

If an item doesn't apply to your changes, leave it unchecked.

### Review

* [x] self-review - I have performed a self-review of this change
according to the [development
guidelines](https://splunk.github.io/addonfactory-ucc-generator/contributing/#development-guidelines)
* [ ] Changes are documented. The documentation is understandable,
examples work [(more
info)](https://splunk.github.io/addonfactory-ucc-generator/contributing/#documentation-guidelines)
* [x] PR title and description follows the [contributing
principles](https://splunk.github.io/addonfactory-ucc-generator/contributing/#pull-requests)
* [ ] meeting - I have scheduled a meeting or recorded a demo to explain
these changes (if there is a video, put a link below and in the ticket)

### Tests

See [the testing
doc](https://splunk.github.io/addonfactory-ucc-generator/contributing/#build-and-test).

* [ ] Unit - tests have been added/modified to cover the changes
* [ ] Smoke - tests have been added/modified to cover the changes
* [ ] UI - tests have been added/modified to cover the changes
* [ ] coverage - I have checked the code coverage of my changes [(see
more)](https://splunk.github.io/addonfactory-ucc-generator/contributing/#checking-the-code-coverage)

**Demo/meeting:**

*Reviewers are encouraged to request meetings or demos if any part of
the change is unclear*

Author: kkedziak-splunk

pyproject.toml

@@ -1,5 +1,5 @@
 #
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

pytest.ini

@@ -1,6 +1,6 @@
 # you may not use this file except in compliance with the License.
 #
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

scripts/build_ui.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

scripts/compare_different_ucc_versions_output.sh

@@ -1,6 +1,6 @@
 #! /usr/bin/env bash
 
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

scripts/include-rum.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

scripts/quick_start_ui.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

scripts/run_splunk.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

splunk_add_on_ucc_framework/__init__.py

@@ -1,5 +1,5 @@
 #
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

splunk_add_on_ucc_framework/__main__.py

@@ -1,5 +1,5 @@
 #
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

splunk_add_on_ucc_framework/app_manifest.py

@@ -1,5 +1,5 @@
 #
-# Copyright 2025 Splunk Inc.
+# Copyright 2026 Splunk Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.