Update sync-uv workflow ref to master branch

Changed the reference for pycord-next/.github/workflows/sync-uv.yml from 'main' to 'master' in all relevant GitHub workflow files to ensure correct branch usage for setup steps.

Author: Lulalaby

.github/workflows/docs-checks.yml

@@ -42,7 +42,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev,docs'
       - name: "Check Links"

.github/workflows/docs-localization-download.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev,docs'
           extras: 'speed,voice'

.github/workflows/docs-localization-upload.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev,docs'
           extras: 'speed,voice'

.github/workflows/lib-checks.yml

@@ -34,7 +34,7 @@ jobs:
       - name: "Checkout Repository"
         uses: actions/checkout@v5
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev'
       - name: "Run codespell"
@@ -51,7 +51,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev'
       - name: "Run ruff linter check"
@@ -69,7 +69,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev'
       - name: "Setup cache"

.github/workflows/sync-guild-features.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: "Setup UV"
-        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@main
+        uses: pycord-development/pycord-next/.github/workflows/sync-uv.yml@master
         with:
           groups: 'dev,ci'
       - name: "Run guild features sync"