Bump golang.org/x/mod from 0.19.0 to 0.20.0 (#1654)

Bumps [golang.org/x/mod](https://github.com/golang/mod) from 0.19.0 to
0.20.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/mod/commit/bc151c4e8ccc31931553c47d43e41c0efc246096"><code>bc151c4</code></a>
README: fix link to x/tools</li>
<li><a
href="https://github.com/golang/mod/commit/d1f873e3c1b2cf7231a30697aea158ae6cfdbb5f"><code>d1f873e</code></a>
modfile: fix Cleanup clobbering Line reference</li>
<li><a
href="https://github.com/golang/mod/commit/b56a28f8bd8379d47ee77b658799ce29061f6abe"><code>b56a28f</code></a>
modfile: Add support for tool lines</li>
<li><a
href="https://github.com/golang/mod/commit/79169e9d3645b69457c3c546644e29ba620146e7"><code>79169e9</code></a>
LICENSE: update per Google Legal</li>
<li>See full diff in <a
href="https://github.com/golang/mod/compare/v0.19.0...v0.20.0">compare
view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // BSD-3-Clause
 	github.com/stretchr/testify v1.9.0 // MIT
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225
-	golang.org/x/mod v0.19.0
+	golang.org/x/mod v0.20.0
 	golang.org/x/oauth2 v0.21.0
 	golang.org/x/sync v0.8.0
 	golang.org/x/term v0.22.0