go: Bump to 1.25  (#168)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2beee95..d3d0012 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -36,9 +36,12 @@
           - ubuntu-latest
           - macos-latest
         go:
-          - "1.18"
-          - "1.19"
           - "1.20"
+          - "1.21"
+          - "1.22"
+          - "1.23"
+          - "1.24"
+          - "1.25"
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
diff --git a/.go-version b/.go-version
index 5fb5a6b..5e2b950 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.20
+1.25