feat(deps)!: upgrade to Go 1.17 and golanci-lint 1.64 (#5)

Upgrade to Go 1.17 and golangci-lint to 1.64, and fix the linting issues
that were found.

Also upgrade CI workflow actions to latest versions, and setup a test
matrix for relevant Go versions.

BREAKING CHANGE: Minimum Go version changed from 1.15 to 1.17.

.github/workflows/ci.yml

@@ -7,11 +7,14 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          version: v1.43
+          go-version-file: 'go.mod'
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.64
         env:
           VERBOSE: "true"
 
@@ -19,34 +22,22 @@ jobs:
     name: Tidy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.15
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version-file: 'go.mod'
       - name: Check if mods are tidy
         run: make check-tidy
 
   benchmark:
     name: Benchmarks
     runs-on: ubuntu-latest
-    if: github.ref != 'refs/heads/master'
+    if: github.ref != 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.15
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version-file: 'go.mod'
       - name: Run benchmarks
         run: make bench | tee output.raw
       - name: Fix benchmark names
@@ -67,18 +58,12 @@ jobs:
     name: Coverage
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.15
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version-file: 'go.mod'
       - name: Publish coverage
-        uses: paambaati/codeclimate-action@v2.7.4
+        uses: paambaati/codeclimate-action@v9
         env:
           VERBOSE: "true"
           GOMAXPROCS: 4
@@ -92,17 +77,22 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version:
+          - "1.17"
+          - "1.18"
+          - "1.19"
+          - "1.20"
+          - "1.21"
+          - "1.22"
+          - "1.23"
+          - "1.24"
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.15
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version: ${{ matrix.go-version }}
       - name: Run tests
         run: make test
         env:
@@ -111,18 +101,12 @@ jobs:
   benchmark-store:
     name: Store benchmarks
     runs-on: ubuntu-latest
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
         with:
-          go-version: 1.15
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
+          go-version-file: 'go.mod'
       - name: Run benchmarks
         run: make bench | tee output.raw
       - name: Fix benchmark names