gh-103726: Set up gcc-10 for ASAN (gh-103728)

<!--
Thanks for your contribution!
Please read this comment in its entirety. It's quite important.

# Pull Request title

It should be in the following format:

```
gh-NNNNN: Summary of the changes made
```

Where: gh-NNNNN refers to the GitHub issue number.

Most PRs will require an issue number. Trivial changes, like fixing a
typo, do not need an issue.

# Backport Pull Request title

If this is a backport PR (PR made against branches other than `main`),
please ensure that the PR title is in the following format:

```
[X.Y] <title from the original PR> (GH-NNNN)
```

Where: [X.Y] is the branch name, e.g. [3.6].

GH-NNNN refers to the PR number from `main`.

-->


<!-- gh-issue-number: gh-103726 -->
* Issue: gh-103726
<!-- /gh-issue-number -->

Author: corona10

.github/workflows/build.yml

@@ -308,6 +308,10 @@ jobs:
       run: echo "::add-matcher::.github/problem-matchers/gcc.json"
     - name: Install Dependencies
       run: sudo ./.github/workflows/posix-deps-apt.sh
+    - name: Set up GCC-10 for ASAN
+      uses: egor-tensin/setup-gcc@v1
+      with:
+        version: 10
     - name: Configure OpenSSL env vars
       run: |
         echo "MULTISSL_DIR=${GITHUB_WORKSPACE}/multissl" >> $GITHUB_ENV