go.mod: Bump required Go version to 1.18

Commit 564b6fc introduced calls to strings.Cut, added in Go 1.18. The fuzz testing also requires 1.18 but that will at least not affect users of the module. Also updating the CI configuration to actually test the Go version we claim to support.
package-url · Oct 9, 2023 · e033e37 · e033e37
1 parent 936a4ac
commit e033e37
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diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.19.x, 1.20.x]
+        go-version: [1.18.x, 1.19.x, 1.20.x]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:

diff --git a/go.mod b/go.mod
@@ -1,3 +1,3 @@
 module github.com/package-url/packageurl-go
 
-go 1.17
+go 1.18