ci: Use ubuntu-22.04 for releases

LLVM 16.0.4, which is our hermetic toolchain, requires Ubuntu 22.04. On 20.04, it fails with:
```
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.29' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang: /lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.13' not found (required by external/toolchains_llvm~0.10.3~llvm~llvm_toolchain_llvm/bin/clang)
```

.github/workflows/prerelease.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             name: linux
           - os: macos-11
             name: macos
@@ -62,7 +62,7 @@ jobs:
           if-no-files-found: error
 
   merge_jars:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: build_release
 
     steps:
@@ -88,8 +88,6 @@ jobs:
           if-no-files-found: error
 
   maven_predeploy:
-    # TODO: Our hermetic toolchain doesn't support ubuntu-latest yet and fails with:
-    # external/llvm_toolchain_llvm/bin/clang: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory
     runs-on: ubuntu-22.04
     needs: merge_jars
 
@@ -129,7 +127,7 @@ jobs:
 
   create_release:
     needs: build_release
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.m04
 
     permissions:
       contents: write # for creating releases

.github/workflows/release.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   docker_push:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     environment:
       name: Deploy
@@ -20,7 +20,7 @@ jobs:
         run: docker/push_all.sh
 
   generate_docs:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
       - name: checkout
@@ -44,7 +44,7 @@ jobs:
           if-no-files-found: error
 
   update_docs:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: generate_docs
 
     environment: