.github/workflows: upgrade to Go 1.23

Go version 1.23 has been released, and because we aim to build and test
Git LFS against only supported versions of Go, we upgrade our GitHub
Actions CI workflows to test against Go versions 1.23 and 1.22.

This resolves a problem now seen in our "Build with specific Go" CI job,
where we install the latest version of the "goimports" package and it
fails because the "x/tools" module requires Go 1.22 as of commit
golang/tools@70f5626, and we are still
using Go 1.21 for that CI job.

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: ['1.22.x']
+        go: ['1.23.x']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
@@ -47,7 +47,7 @@ jobs:
     name: Build with specific Go
     strategy:
       matrix:
-        go: ['1.21.x']
+        go: ['1.22.x']
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -76,7 +76,7 @@ jobs:
       # which does not honour the PATH we set to our built git-lfs binary.
     - uses: actions/setup-go@v5
       with:
-        go-version: '1.22.x'
+        go-version: '1.23.x'
     - run: mkdir -p "$HOME/go/bin"
       shell: bash
     - run: set GOPATH=%HOME%\go
@@ -137,7 +137,7 @@ jobs:
         fetch-depth: 0
     - uses: actions/setup-go@v5
       with:
-        go-version: '1.22.x'
+        go-version: '1.23.x'
     - run: git fetch origin "+${GITHUB_REF}:${GITHUB_REF}"
       if: ${{ github.ref_type == 'tag' }}
     - run: git clone -b master https://github.com/git/git.git "$HOME/git"
@@ -161,7 +161,7 @@ jobs:
         fetch-depth: 0
     - uses: actions/setup-go@v5
       with:
-        go-version: '1.22.x'
+        go-version: '1.23.x'
     - run: git fetch origin "+${GITHUB_REF}:${GITHUB_REF}"
       if: ${{ github.ref_type == 'tag' }}
     - run: git clone -b v2.0.0 https://github.com/git/git.git "$HOME/git"

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        go: ['1.22.x']
+        go: ['1.23.x']
     steps:
     - uses: actions/checkout@v4
       with:
@@ -104,7 +104,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        go: ['1.22.x']
+        go: ['1.23.x']
     steps:
     - uses: actions/checkout@v4
       with:
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ['1.22.x']
+        go: ['1.23.x']
     steps:
     - uses: actions/checkout@v4
       with: