Update ubuntu Docker tag to v26

Author: renovate[bot]

.github/workflows/ci.yml

@@ -199,7 +199,7 @@ jobs:
   bazel-ubuntu:
     name: bazel ubuntu amd64
     runs-on: ubuntu-latest
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     timeout-minutes: 30
     steps:
       - name: setup
@@ -241,7 +241,7 @@ jobs:
   bazel-ubuntu-arm64:
     name: bazel ubuntu arm64
     runs-on: ubuntu-24.04-arm
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     timeout-minutes: 30
     steps:
       - name: setup
@@ -555,7 +555,7 @@ jobs:
   cmake-ubuntu:
     name: cmake ubuntu amd64
     runs-on: ubuntu-latest
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |
@@ -608,7 +608,7 @@ jobs:
   cmake-ubuntu-arm64:
     name: cmake ubuntu arm64
     runs-on: ubuntu-24.04-arm
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |

.github/workflows/meson.yml

@@ -274,7 +274,7 @@ jobs:
   meson-ubuntu:
     name: ubuntu amd64
     runs-on: ubuntu-latest
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     timeout-minutes: 30
     steps:
       - name: setup
@@ -314,7 +314,7 @@ jobs:
   meson-ubuntu-arm64:
     name: ubuntu arm64
     runs-on: ubuntu-24.04-arm
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     timeout-minutes: 30
     steps:
       - name: setup

Dockerfile

@@ -34,7 +34,7 @@
 # <https://gamma.cs.unc.edu/RVO2/>
 #
 
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 ARG TARGETARCH
 LABEL org.opencontainers.image.authors="Jur van den Berg, Stephen J. Guy, Jamie Snape, Ming C. Lin, Dinesh Manocha"
 LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:24.04"