Bump github.com/a8m/envsubst from 1.4.2 to 1.4.3

Bumps [github.com/a8m/envsubst](https://github.com/a8m/envsubst) from 1.4.2 to 1.4.3.
- [Release notes](https://github.com/a8m/envsubst/releases)
- [Commits](a8m/envsubst@v1.4.2...v1.4.3)

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

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

go.mod

@@ -1,7 +1,7 @@
 module github.com/mikefarah/yq/v4
 
 require (
-	github.com/a8m/envsubst v1.4.2
+	github.com/a8m/envsubst v1.4.3
 	github.com/alecthomas/participle/v2 v2.1.1
 	github.com/alecthomas/repr v0.4.0
 	github.com/dimchansky/utfbom v1.1.1
@@ -30,3 +30,4 @@ require (
 )
 
 go 1.23.0
+toolchain go1.24.0

go.sum

@@ -1,5 +1,5 @@
-github.com/a8m/envsubst v1.4.2 h1:4yWIHXOLEJHQEFd4UjrWDrYeYlV7ncFWJOCBRLOZHQg=
-github.com/a8m/envsubst v1.4.2/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
+github.com/a8m/envsubst v1.4.3 h1:kDF7paGK8QACWYaQo6KtyYBozY2jhQrTuNNuUxQkhJY=
+github.com/a8m/envsubst v1.4.3/go.mod h1:4jjHWQlZoaXPoLQUb7H2qT4iLkZDdmEQiOUogdUmqVU=
 github.com/alecthomas/assert/v2 v2.3.0 h1:mAsH2wmvjsuvyBvAmCtm7zFsBlb8mIHx5ySLVdDZXL0=
 github.com/alecthomas/assert/v2 v2.3.0/go.mod h1:pXcQ2Asjp247dahGEmsZ6ru0UVwnkhktn7S0bBDLxvQ=
 github.com/alecthomas/participle/v2 v2.1.1 h1:hrjKESvSqGHzRb4yW1ciisFJ4p3MGYih6icjJvbsmV8=