error: "memory exhausted" when defining more than 9994 local-zones

**Describe the bug**
unbound 1.21 does not start anymore with the same config files that worked in 1.20. The error originates when parsing the config file:
```
# unbound-checkconf 
/etc/unbound/blocklist.conf:9994: error: memory exhausted
read /etc/unbound/unbound.conf failed: 1 errors in configuration file
```

Minimal `unbound.conf`
```
server:
        access-control-view: 192.168.0.0/16 adware_view
view:
        name: "adware_view"
        include: /etc/unbound/blocklist.conf
```

With `blocklist.conf` containing LOTS of entries like
`local-zone: "some.domain.com" always_nxdomain`

Sample configuration files are here:
[config_files.tar.gz](https://github.com/user-attachments/files/16716734/config_files.tar.gz)


If `blocklist.conf` is stripped down to 9993 lines, it works and `unbound` consumes around ~12M memory. So, this doesn't look like an OOM error.
With `unbound` 1.20 I had around 170k local-zone entries and with a memory consumption of around ~75M.
If this setup is somehow not supported anymore, how would I change it?


**To reproduce**
1. Use attached config files
2. Execute `unbound-checkconf`

**Expected behavior**
`unbound` still works.

**System:**
 - Unbound version: 1.21
 - OS: Linux Arch 
 - `unbound -V` output:
```
 Version 1.21.0

Configure line: --prefix=/usr --sysconfdir=/etc --localstatedir=/var --sbindir=/usr/bin --disable-rpath --enable-dnscrypt --enable-dnstap --enable-pie --enable-relro-now --enable-subnet --enable-systemd --enable-tfo-client --enable-tfo-server --enable-cachedb --with-libhiredis --with-conf-file=/etc/unbound/unbound.conf --with-pidfile=/run/unbound.pid --with-rootkey-file=/etc/trusted-key.key --with-libevent --with-libnghttp2 --with-pyunbound
Linked libs: libevent 2.1.12-stable (it uses epoll), OpenSSL 3.3.1 4 Jun 2024
Linked modules: dns64 cachedb subnetcache respip validator iterator
DNSCrypt feature available
TCP Fastopen feature available

BSD licensed, see LICENSE in source package for details.
Report bugs to unbound-bugs@nlnetlabs.nl or https://github.com/NLnetLabs/unbound/issues
```

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error: "memory exhausted" when defining more than 9994 local-zones #1127

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error: "memory exhausted" when defining more than 9994 local-zones #1127

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