Update GitHub actions

Author: MightyCreak

.github/workflows/ci.yml

@@ -16,8 +16,8 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
 
     - name: Install dependencies
       run: |
@@ -37,8 +37,8 @@ jobs:
   meson-build-test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
 
     - name: Install dependencies
       run: |
@@ -61,10 +61,10 @@ jobs:
       image: bilelmoussaoui/flatpak-github-actions:gnome-40
       options: --privileged
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
     - name: Flatpak builder
-      uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v3
+      uses: flatpak/flatpak-github-actions/flatpak-builder@v4
       with:
         bundle: "diffuse.flatpak"
         manifest-path: "io.github.mightycreak.Diffuse.yml"