install-from-source: update libssl for alpine

The `validate-install-from-source` workflow is currently failing [1]. According
to [2] and [3], the solution is to upgrade the libssl version from 1.1 to 3, as
version 1.1 is out of support. Since this version is only supported on Alpine
3.15 and later, we fail if a user attempts to run the `install-from-source.sh`
script on an incompatible version.

1: https://github.com/git-ecosystem/git-credential-manager/actions/runs/8604126129
2: https://stackoverflow.com/questions/77640298/dockerfile-unable-to-select-packages-linux-alpine
3: https://learn.microsoft.com/en-us/dotnet/core/install/linux-alpine

src/linux/Packaging.Linux/install-from-source.sh

@@ -186,10 +186,16 @@ case "$distribution" in
         ensure_dotnet_installed
     ;;
     alpine)
+        # Check that the version is at least 3.15
+        if [[ $(echo "$version 3.15" | awk '{print ($1 < $2)}') -ne 0 ]]; then
+            echo "You are running Alpine $version. This script requires at least Alpine 3.15."
+            exit 1
+        fi
+
         $sudo_cmd apk update
 
         # Install dotnet/GCM dependencies.
-        install_packages apk add "curl git icu-libs krb5-libs libgcc libintl libssl1.1 libstdc++ zlib which bash coreutils gcompat"
+        install_packages apk add "curl git icu-libs krb5-libs libgcc libintl libssl3 libstdc++ zlib which bash coreutils gcompat"
 
         ensure_dotnet_installed
     ;;