Update GitHub Actions

.github/actions/install-tmt/action.yml

@@ -4,9 +4,9 @@ runs:
   using: 'composite'
   steps:
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
-        python-version: '3.12.14'
+        python-version: '3.14.7'
     - name: Install tmt
       shell: bash
       run: |

.github/workflows/build-and-publish.yml

@@ -24,7 +24,7 @@ jobs:
           # centos-9 UKI is experimental/broken (https://github.com/bootc-dev/bootc/issues/1812)
           - test_os: centos-9
             variant: composefs-sealeduki-sdboot
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - uses: actions/checkout@v7
       - name: Bootc Ubuntu Setup

.github/workflows/crates-release.yml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch: {}
 jobs:
   publish:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       id-token: write     # Required for OIDC token exchange
     steps:

.github/workflows/docs.yml

@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - uses: actions/checkout@v7
       - name: Bootc Ubuntu Setup