.github/workflows: update Go to 1.19, drop 1.16

Also run the formatting and module checks with 1.19. Change the checks
and cross-compile step to run on Ubuntu 22.04 instead of 20.04.

.github/workflows/static-analysis.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Install Go
       uses: actions/setup-go@84cbf8094393cdc5fe1fe1671ff2647332956b1a
       with:
-        go-version: '1.18'
+        go-version: '1.19'
 
     - name: Check out code
       uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
   build-and-test:
     strategy:
       matrix:
-        go-version: [ '1.16', '1.17', '1.18' ]
+        go-version: [1.17, 1.18, 1.19]
         os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, macos-11, macos-12]
     runs-on: ${{ matrix.os }}
 
@@ -26,17 +26,17 @@ jobs:
       uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
 
     - name: Check formatting
-      if: ${{ matrix.go-version == '1.18' && matrix.os == 'ubuntu-20.04' }}
+      if: ${{ matrix.go-version == '1.19' && matrix.os == 'ubuntu-22.04' }}
       run: diff -u <(echo -n) <(gofmt -d .)
 
     - name: Check Go modules
-      if: ${{ matrix.go-version == '1.18' && matrix.os == 'ubuntu-20.04' }}
+      if: ${{ matrix.go-version == '1.19' && matrix.os == 'ubuntu-22.04' }}
       run: |
         go mod tidy
         git diff --exit-code
 
     - name: Build (cross-compile)
-      if: matrix.os == 'ubuntu-20.04'
+      if: matrix.os == 'ubuntu-22.04'
       run: |
         GOOS=darwin go build ./...
         GOOS=dragonfly go build ./...