Use Ubuntu 22.04 for building/testing generated binaries

We've previously used Ubuntu 20.04 for the x86_64 binary, to avoid
building a too new glibc. Unfortunately with Ubuntu 20.04 GH actions
on the way out, this seems to no longer work reliably. Separately, we
were already building the arm64 packages with an undefined Ubuntu version
(likely 24.04?).

To fix, consistently use Ubuntu 22.04 (glibc 2.35) for both x86_64 and
arm64. This also switches to GitHub's ARM runners from Ubicloud, since
Ubicloud does not offer tagged Ubuntu versions in their runners.

.github/workflows/release.yml

@@ -7,9 +7,7 @@ on:
 
 jobs:
   build:
-    # Use older Ubuntu release to avoid building with a too new glibc, which will cause
-    # errors on older distributions, if anyone uses the generated binary directly.
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     permissions: {}
     # ensure we don't release on create events for branches (only tags)
     if: ${{ startsWith( github.ref, 'refs/tags' ) }}
@@ -46,7 +44,7 @@ jobs:
         path: pganalyze-collector-linux-amd64
 
   build_arm:
-    runs-on: ubicloud-standard-2-arm
+    runs-on: ubuntu-22.04-arm
     permissions: {}
     # ensure we don't release on create events for branches (only tags)
     if: ${{ startsWith( github.ref, 'refs/tags' ) }}
@@ -56,7 +54,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v5
       with:
-        go-version: 1.21
+        go-version: 1.23
       id: go
 
     - name: Set up protoc