ci: pin actions/setup-dotnet action to v5 (#277)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0
 
       - name: 🔽 Setup dotnet from global.json
-        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5
+        uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
         with:
           global-json-file: global.json
           dotnet-version: |

.github/workflows/release-please.yml

@@ -68,7 +68,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: 🔽 Setup dotnet from global.json
-        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5
+        uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
         with:
           global-json-file: global.json
           dotnet-version: |
@@ -134,7 +134,7 @@ jobs:
           name: global-json
 
       - name: 🔽 Install dotnet
-        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5
+        uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
         with:
           global-json-file: global.json
           dotnet-version: |
@@ -170,7 +170,7 @@ jobs:
           name: global-json
 
       - name: 🔽 Install dotnet
-        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5
+        uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5
         with:
           global-json-file: global.json
           dotnet-version: |