🌱(deps): Bump github.com/a8m/envsubst in /hack/tools

Bumps [github.com/a8m/envsubst](https://github.com/a8m/envsubst) from 1.2.0 to 1.4.2.
- [Release notes](https://github.com/a8m/envsubst/releases)
- [Commits](a8m/envsubst@v1.2.0...v1.4.2)

---
updated-dependencies:
- dependency-name: github.com/a8m/envsubst
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

hack/tools/go.mod

@@ -3,7 +3,7 @@ module sigs.k8s.io/cluster-api-provider-openstack/hack/tools
 go 1.22.0
 
 require (
-	github.com/a8m/envsubst v1.2.0
+	github.com/a8m/envsubst v1.4.2
 	github.com/ahmetb/gen-crd-api-reference-docs v0.3.1-0.20220420215017-3f29e6853552
 	github.com/itchyny/gojq v0.12.2
 	github.com/onsi/ginkgo/v2 v2.21.0

hack/tools/go.sum

@@ -14,8 +14,8 @@ github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cq
 github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
 github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 h1:wPbRQzjjwFc0ih8puEVAOFGELsn1zoIIYdxvML7mDxA=
 github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8/go.mod h1:I0gYDMZ6Z5GRU7l58bNFSkPTFN6Yl12dsUlAZ8xy98g=
-github.com/a8m/envsubst v1.2.0 h1:yvzAhJD2QKdo35Ut03wIfXQmg+ta3wC/1bskfZynz+Q=
-github.com/a8m/envsubst v1.2.0/go.mod h1:PpvLvNWa+Rvu/10qXmFbFiGICIU5hZvFJNPCCkUaObg=
+github.com/a8m/envsubst v1.4.2 h1:4yWIHXOLEJHQEFd4UjrWDrYeYlV7ncFWJOCBRLOZHQg=
+github.com/a8m/envsubst v1.4.2/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
 github.com/adrg/xdg v0.5.0 h1:dDaZvhMXatArP1NPHhnfaQUqWBLBsmx1h1HXQdMoFCY=
 github.com/adrg/xdg v0.5.0/go.mod h1:dDdY4M4DF9Rjy4kHPeNL+ilVF+p2lK8IdM9/rTSGcI4=
 github.com/ahmetb/gen-crd-api-reference-docs v0.3.1-0.20220420215017-3f29e6853552 h1:ppHFRuYry83Rkj933CxFXAV4F2ciIdVz/uLuELSG1DI=