Update GZip requirement from 0.5, 0.6 to 0.5, 0.6, 0.7 (#257)

Updates the requirements on [GZip](https://github.com/JuliaIO/GZip.jl) to permit the latest version.
- [Release notes](https://github.com/JuliaIO/GZip.jl/releases)
- [Commits](https://github.com/JuliaIO/GZip.jl/commits/v0.7.1)

---
updated-dependencies:
- dependency-name: GZip
  dependency-version: 0.7.1
  dependency-type: direct:production
...

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Project.toml

@@ -38,7 +38,7 @@ DataFrames = "1.3"
 DelimitedFiles = "1"
 FileIO = "1.14"
 FixedPointNumbers = "0.8, 0.9"
-GZip = "0.5, 0.6"
+GZip = "0.5, 0.6, 0.7"
 Glob = "1.3"
 HDF5 = "0.16.2, 0.17"
 ImageShow = "0.3"