chore(deps): update dependency ubuntu to v26

Author: renovate[bot]

.github/workflows/GnuTests.yml

@@ -24,7 +24,7 @@ env:
 jobs:
   native:
     name: Run GNU diffutils testsuite
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -91,7 +91,7 @@ jobs:
       contents: read
       pull-requests: read
     name: Aggregate GNU test results
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Initialize workflow variables
         id: vars

.github/workflows/release.yml

@@ -47,7 +47,7 @@ on:
 jobs:
   # Run 'dist plan' (or host) to determine what tasks we need to do
   plan:
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-26.04"
     outputs:
       val: ${{ steps.plan.outputs.manifest }}
       tag: ${{ !github.event.pull_request && github.ref_name || '' }}
@@ -170,7 +170,7 @@ jobs:
     needs:
       - plan
       - build-local-artifacts
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-26.04"
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       BUILD_MANIFEST_NAME: target/distrib/global-dist-manifest.json
@@ -221,7 +221,7 @@ jobs:
     if: ${{ always() && needs.plan.result == 'success' && needs.plan.outputs.publishing == 'true' && (needs.build-global-artifacts.result == 'skipped' || needs.build-global-artifacts.result == 'success') && (needs.build-local-artifacts.result == 'skipped' || needs.build-local-artifacts.result == 'success') }}
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-26.04"
     outputs:
       val: ${{ steps.host.outputs.manifest }}
     steps:
@@ -286,7 +286,7 @@ jobs:
     # still allowing individual publish jobs to skip themselves (for prereleases).
     # "host" however must run to completion, no skipping allowed!
     if: ${{ always() && needs.host.result == 'success' }}
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-26.04"
     env:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps: