chore: require go 1.22/1.23, upgrade protobuf, upgrade all deps

Go upgrade:
- Go 1.23 is current => use that for release builds
- Go 1.22 is less than one year old, it's desirable to support it.
- The [`Go Toolchains`](https://go.dev/doc/toolchain) stuff is available
  in both of these (would also be in Go 1.21). That is quite nice stuff,
  but required some changes to how we versions we use in CircleCI and
  the `release-docker` Makefile target.

Protobuf upgrade:
- Go to protobuf GH release website
- Download latest locally
- run `sha256sum`
- replace existing pinned hashes
- `make generate`

Deps upgrade:
- `go get -t -u all`
- repository moves aren't handled well automatically, fix manually
- repeat until no changes

.circleci/config.yml

@@ -1,8 +1,8 @@
 version: 2.1
 orbs:
-  # NB: 1.7.2 is not the Go version, but the Orb version
+  # NB: this is not the Go version, but the Orb version
   # https://circleci.com/developer/orbs/orb/circleci/go#usage-go-modules-cache
-  go: circleci/go@1.7.2
+  go: circleci/go@1.11.0
 commands:
   setup-home-local-bin:
     steps:
@@ -99,10 +99,6 @@ parameters:
     type: boolean
     default: false
 
-  release_docker_baseimage_tag:
-    type: string
-    default: "1.21"
-
 workflows:
   version: 2
 
@@ -110,20 +106,20 @@ workflows:
     when: << pipeline.parameters.do_ci >>
     jobs:
       - quickcheck-docs
-      - quickcheck-go: &quickcheck-go-smoketest
-          name: quickcheck-go-amd64-linux-1.21
-          goversion: &latest-go-release "1.21"
+      - quickcheck-go:
+          name: quickcheck-go-amd64-linux-1.23.1
+          goversion: &latest-go-release "1.23.1"
           goos: linux
           goarch: amd64
-      - test-go-on-latest-go-release:
+      - test-go:
           goversion: *latest-go-release
       - quickcheck-go:
           requires:
-            - quickcheck-go-amd64-linux-1.21 #quickcheck-go-smoketest.name
-          matrix: &quickcheck-go-matrix
+            - quickcheck-go-amd64-linux-1.23.1 #quickcheck-go-smoketest.name
+          matrix:
             alias: quickcheck-go-matrix
             parameters:
-              goversion: [*latest-go-release, "1.20"]
+              goversion: [*latest-go-release, "1.22.7"]
               goos: ["linux", "freebsd"]
               goarch: ["amd64", "arm64"]
             exclude:
@@ -138,6 +134,7 @@ workflows:
               goos: ["linux"]
               goarch: ["amd64"]
           requires:
+            - test-go
             - quickcheck-go-<< matrix.goarch >>-<< matrix.goos >>-<< matrix.goversion >>
 
   release:
@@ -167,7 +164,7 @@ workflows:
 jobs:
   quickcheck-docs:
     docker:
-      - image: cimg/base:2023.09
+      - image: cimg/base:2024.09
     steps:
       - checkout
       - install-docdep
@@ -186,10 +183,12 @@ jobs:
       goarch:
         type: string
     docker:
-      - image: cimg/go:<<parameters.goversion>>
+      # any toolchain >= 1.22 will auto-download GOTOOLCHAIN
+      - image: &cimg_with_modern_go cimg/go:1.22
     environment:
       GOOS: <<parameters.goos>>
       GOARCH: <<parameters.goarch>>
+      GOTOOLCHAIN: "go<<parameters.goversion>>"
 
     steps:
       - checkout
@@ -237,12 +236,14 @@ jobs:
       - run: sudo zfs version
       - run: sudo make test-platform GOOS="$GOOS" GOARCH="$GOARCH"
 
-  test-go-on-latest-go-release:
+  test-go:
     parameters:
       goversion:
         type: string
     docker:
-      - image: cimg/go:<<parameters.goversion>>
+      - image: *cimg_with_modern_go
+    environment:
+      GOTOOLCHAIN: "go<<parameters.goversion>>"
     steps:
       - checkout
       - go/load-cache:
@@ -256,7 +257,7 @@ jobs:
       image: ubuntu-2004:202201-02
     steps:
       - checkout
-      - run: make release-docker RELEASE_DOCKER_BASEIMAGE_TAG=<<pipeline.parameters.release_docker_baseimage_tag>>
+      - run: make release-docker
       - persist_to_workspace:
           root: .
           paths: [.]
@@ -286,7 +287,7 @@ jobs:
 
   release-upload:
     docker:
-      - image: cimg/base:2020.08
+      - image: cimg/base:2024.09
     steps:
       - attach_workspace:
           at: .
@@ -296,7 +297,7 @@ jobs:
 
   publish-zrepl-github-io:
     docker:
-      - image: cimg/base:2023.09
+      - image: cimg/base:2024.09
     steps:
       - checkout
       - install-docdep